Balancing GDD in the Transmitted and Reflected BeamWhen using the UFBS5050 ultrafast beamsplitter with pulses shorter than 50 fs, we recommend inserting one of our 1.0 mm thick Infrasil windows into the reflected beam at a 0° angle of incidence in order to balance the GDD. We offer 1.0 mm thick Infrasil windows in Ø1/2" (Item # UDP05) and Ø1" (Item # UDP10) sizes. The uncoated windows have flat transmission from 300 nm to 3 µm, as shown in the table below. Using one of these 1.0 mm thick windows reduces the GDD difference between the transmitted and reflected arms to <20 fs2 at 800 nm. Longer pulses have a narrow spectral bandwidth that negates the need for additional dispersion compensation. See the Group Delay tab for additional details. For our other ultrafast beamsplitters, our 1.0 mm thick Infrasil windows are not thick enough to balance the dispersion exactly, but they will still improve dispersion matching between the beams. When using our 4.0 mm thick beamsplitters, the 3.0 mm and 5.0 mm thick Infrasil window (Item #s UDP053 and UDP105) may be used to provide some dispersion compensation, although it was not specifically designed to match those items. Alternatively, one of our uncoated UV fused silica windows may be used.

Beam splitterworking principle

Liquid is now the preferred company of many famous rockers, including Disturbed, Daughtry and Alice Cooper.

"We are an independent sunglass company, and are associated with a lot of musicians and musical groups," Linde said, adding Food Network personality Guy Fieri also sports their sunglasses.

"Ken Wilson founded the company." Linde said. "He is the guru of aluminum eyewear. He really is. He actually started a company called Gatorz back in the early '90s because he was tired of plastic glasses. He decided to work with aluminum and that is where Gatorz came from. He sold that in 2000, and tried to retire but couldn't. He is really at heart an engineer. He loves to design and create, so that is where Liquid came from."

The custom-patented sunglass designs created by Liquid set the company apart from other more mainstream companies, Linde said.

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Air Conditioners · Air Purifiers · Dehumidifiers ... Canned & Jarred Foods · Cereal · Emergency Food Kits ... buy large quantity, get best value... Product ...

Beam splitter laserfor sale

Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.

Reflected BeamThe beamsplitting coating is designed to impart on the reflected pulse the same amount of dispersion as traveling through 0.7 mm of fused silica (see the table to the right). The plot below on the right shows that the measured group delay of the reflected beam is similar to the calculated group delay through 0.7 mm of fused silica, as expected. The measurement stops at 1100 nm due to limitations of the white light interferometer used for this test.

When Rock and Roll Hall of Famer and former Van Halen front man Sammy Hagar wanted a unique line of sunglasses in 2000, he didn't approach Ray Ban or Oakley. Instead, he called Liquid Eyewear. "Sammy Hagar, when we first started Liquid, asked if we could do a private label for him and we did," said Kristen Linde, Liquid co-owner. "That was what really gave us the funding to start Liquid. We still to this day do eyewear for him." 

Liquid is now the preferred company of many famous rockers, including Disturbed, Daughtry and Alice Cooper.

"We are an independent sunglass company, and are associated with a lot of musicians and musical groups," Linde said, adding Food Network personality Guy Fieri also sports their sunglasses.

"Ken Wilson founded the company." Linde said. "He is the guru of aluminum eyewear. He really is. He actually started a company called Gatorz back in the early '90s because he was tired of plastic glasses. He decided to work with aluminum and that is where Gatorz came from. He sold that in 2000, and tried to retire but couldn't. He is really at heart an engineer. He loves to design and create, so that is where Liquid came from."

The custom-patented sunglass designs created by Liquid set the company apart from other more mainstream companies, Linde said.

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Polarizingbeam splitterprinciple

The custom-patented sunglass designs created by Liquid set the company apart from other more mainstream companies, Linde said.

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Thorlabs offers both 1.0 mm, 3.0 mm, and 5.0 mm thick Infrasil windows. The 1 mm thick windows are recommended for use with the UFBS5050 ultrafast beamsplitter with pulses shorter than 50 fs. See the Group Delay tab for more details.

Diffractivebeam splitter

Sammy Hagar has been wearing Liquid Eyewear sunglasses for years. Here's your chance to own the very same shades—the ultimate in quality, durability, fit, and looks! (SCROLL DOWN for more info, photos, & video)

The brightest, cleanest white among Sherwin-Williams colors. Illuminate the dimmest corners in your home. ... High Reflective White (SW 7757), a white paint color ...

Transmitted BeamWhen the UFBS5050 beamsplitter is oriented at a 45° incident angle, the transmitted pulse will be dispersed by traveling 1.7 mm through the Infrasil substrate (assuming the substrate is 1.5 mm thick). The plot below on the left compares the measured group delay through the UFBS5050 beamsplitter to the calculated group delay through 1.7 mm of Infrasil.

Thorlabs' Ultrafast Broadband Beamsplitters offer a 20:80, 50:50, 80:20, or 90:10 (R:T) beamsplitting ratio over the 600 - 1500 nm wavelength range, or a 50:50 (R:T) beamsplitting ratio over the 1000 - 2000 nm wavelength range. They are designed to be used with p-polarized light incident at 45° and are not intended to be used for s-polarized light. For s-polarized or circularly polarized light applications, please see our full selection of plate beamsplitters. As shown by the images at the top of the page, each ultrafast beamsplitter is marked with an arrow that points toward the beamsplitting coating; light being split should be incident on this surface to obtain the intended performance. The wide usable wavelength range of these beamsplitters makes them compatible with femtosecond pulsed Ti:Sapphire, Yb, and Er fiber lasers. The beamsplitters have an AR coating on the back surface that provides <0.5% absolute reflectance over the same wavelength range as the beamsplitter coating. The Infrasil substrate is a type of optical quartz that has nearly identical dispersion to fused silica but higher internal transmission around 1380 nm.

NoIR designs and manufactures internationally certified laser safety eyewear, laser windows, sunglasses, and low vision eyewear.

The ultimate for people who want extremely durable sunglasses with wrap-around sun and wind protection. They won't slip off during activity, so they're great for motorcycle/bike riding and skydiving. Favored by Extreme Sport athletes, Military, and Law Enforcement. And they look Bad to the Bone!

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Beam splitterthorlabs

The PLAYER has a slightly smaller and sleeker frame. Great for women or men looking for smaller sunglasses. Features teardrop-shaped lenses. For small medium faces.

Apr 11, 2021 — What to Know · App: Go to your profile, tap Edit Profile, add your link in the Website field and tap Done. · Website: Select your profile picture ...

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Thorlabs' selection of ultrafast optics also includes low-GDD mirrors for 700 - 930 nm, 950 - 1170 nm, 1400 - 1700 nm, and 1760 - 2250 nm. For our full selection, please see the Ultrafast Optics tab.

Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices.

"Sammy Hagar, when we first started Liquid, asked if we could do a private label for him and we did," said Kristen Linde, Liquid co-owner. "That was what really gave us the funding to start Liquid. We still to this day do eyewear for him." 

Liquid is now the preferred company of many famous rockers, including Disturbed, Daughtry and Alice Cooper.

"We are an independent sunglass company, and are associated with a lot of musicians and musical groups," Linde said, adding Food Network personality Guy Fieri also sports their sunglasses.

"Ken Wilson founded the company." Linde said. "He is the guru of aluminum eyewear. He really is. He actually started a company called Gatorz back in the early '90s because he was tired of plastic glasses. He decided to work with aluminum and that is where Gatorz came from. He sold that in 2000, and tried to retire but couldn't. He is really at heart an engineer. He loves to design and create, so that is where Liquid came from."

The custom-patented sunglass designs created by Liquid set the company apart from other more mainstream companies, Linde said.

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Beam SplitterPrice

"Ken Wilson founded the company." Linde said. "He is the guru of aluminum eyewear. He really is. He actually started a company called Gatorz back in the early '90s because he was tired of plastic glasses. He decided to work with aluminum and that is where Gatorz came from. He sold that in 2000, and tried to retire but couldn't. He is really at heart an engineer. He loves to design and create, so that is where Liquid came from."

The custom-patented sunglass designs created by Liquid set the company apart from other more mainstream companies, Linde said.

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

In order to balance the dispersion of the reflected beam with that of the transmitted beam, either of our 1.0 mm thick Infrasil windows can be inserted into the reflected beam at a 0° incident angle. This geometry is shown in the figure to the right. The window allows the net dispersion of the reflected beam to be the same as traveling through 1.7 mm of Infrasil. For pulses with narrow spectral bandwidth (i.e., pulses longer than 50 fs), the group delay dispersion varies slowly enough that this additional window is not necessary.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Mar 30, 2021 — The collimator lens is then used to generate parallel rays. The following transmission diffraction grating is the core element of the ...

For nearly 30 years, Van Halen Store has been providing the world's largest selection of Van Halen and EVH merchandise and collectibles. Everything you find here is authentic and officially licensed. Owned and operated by the same people who bring you the Van Halen News Desk. Naturally, we're HUGE Van Halen fans! Read more About Us.

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Liquid Eyewear's hingeless sunglasses are made from durable, lightweight, aircraft-aluminum that contours for maximum comfort on any size face. They're ultra-tough and for the most part indestructible.

LENS/PRICES: All frames are made of the same lightweight, high performance Aircraft Aluminum, so prices are based solely on the lens. We offer 3 models with black frames and Smoke 100% UV Lenses for on sale for $119, and several models of various colored frames with POLARIZED Lenses on sale for $149. More about LIQUID EYEWEAR Liquid Eyewear co-owner Kristen Linde shows how a pair of sunglasses is assembled. Here she installs one of two tinted lenses into a frame. One reason the Liquid Eyewear brand of sunglasses is popular with the military and law enforcement is the product's durability. Here is a pair of sunglasses that was hit with buckshot from a shotgun. When Rock and Roll Hall of Famer and former Van Halen front man Sammy Hagar wanted a unique line of sunglasses in 2000, he didn't approach Ray Ban or Oakley. Instead, he called Liquid Eyewear. "Sammy Hagar, when we first started Liquid, asked if we could do a private label for him and we did," said Kristen Linde, Liquid co-owner. "That was what really gave us the funding to start Liquid. We still to this day do eyewear for him." 

Liquid is now the preferred company of many famous rockers, including Disturbed, Daughtry and Alice Cooper.

"We are an independent sunglass company, and are associated with a lot of musicians and musical groups," Linde said, adding Food Network personality Guy Fieri also sports their sunglasses.

"Ken Wilson founded the company." Linde said. "He is the guru of aluminum eyewear. He really is. He actually started a company called Gatorz back in the early '90s because he was tired of plastic glasses. He decided to work with aluminum and that is where Gatorz came from. He sold that in 2000, and tried to retire but couldn't. He is really at heart an engineer. He loves to design and create, so that is where Liquid came from."

The custom-patented sunglass designs created by Liquid set the company apart from other more mainstream companies, Linde said.

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

by S Halachmi · 2012 · Cited by 28 — Laser hair removal at lower fluences, delivered under certain conditions, may retain the efficacy of high-fluence lasers while improving tolerability.

Beam SplitterTeleprompter

May 28, 2024 — The Nd:YAG laser (neodymium-doped yttrium aluminum garnet) is a type of laser that emits light at a wavelength of 1064 nanometers. This ...

Different types of distortion. image distortion: pincushion / barrel. Wide-angle lenses in retrofocus design (back focal lengths greater than ...

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Mounting OptionsOur ultrafast beamsplitters and Infrasil windows are too thin for standard setscrew-based mounts. Hence, we recommend mounting them in retaining-ring-based mounts, such as our Polaris® SM1-threaded mounts or fixed optic mounts. Retaining rings apply less mechanical stress to the optic than setscrews, helping to prevent bending of the optical surfaces, which compromises performance. The 4.0 mm thick beamsplitters can also be mounted in our Polaris Low-Distortion Optic Mounts. Alternatively, the beamsplitters can be installed in a POLARIS-K1C4 glue-in kinematic mirror mount or a POLARIS-B1G glue-in fixed mount. The POLARIS-B1G features two cut-outs to maximize the transmissive clear aperture at 45° AOI, making it an ideal mount for a plate beamsplitter.

The UFBS5050 Ultrafast Beamsplitter provides a 50:50 beamsplitting ratio for femtosecond laser pulses with well-defined, nearly equal group delay dispersion in the transmitted and reflected beams. For the shortest pulses (<50 fs), additional dispersion compensation is recommended, as detailed in the text below. Please note for the following discussion that Infrasil® and fused silica have nearly identical dispersion.

"We are an independent sunglass company, and are associated with a lot of musicians and musical groups," Linde said, adding Food Network personality Guy Fieri also sports their sunglasses.

"Ken Wilson founded the company." Linde said. "He is the guru of aluminum eyewear. He really is. He actually started a company called Gatorz back in the early '90s because he was tired of plastic glasses. He decided to work with aluminum and that is where Gatorz came from. He sold that in 2000, and tried to retire but couldn't. He is really at heart an engineer. He loves to design and create, so that is where Liquid came from."

The custom-patented sunglass designs created by Liquid set the company apart from other more mainstream companies, Linde said.

"The hingeless design, which is what we are known for now in the industry, withstands anything. It is the most durable sunglass anywhere. It's aluminum, it's flexible and lightweight."

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!

The sunglasses are so durable, they are highly sought after by skydivers, sports athletes and those serving in the military. That is because the glasses are battle-tested.

"We do tests here all the time, and we shot one with a shotgun. We call them roll cages for your eyeballs," Linde said. "That is really what they are. That is really what we are known for—our durability and the aluminum eye wear—plus their coolness."

"Our product is made in America," she said. "Our machine shop is in San Diego, our powder coating is in Phoenix and our plating and anodizing is in Chula Vista. We cut our own lenses (which) come out of Illinois. Nothing is outsourced. Really and truly—we do it all. We are really proud of the fact that we've kept it here on American soil and I think that also helps promote our growth and people wanting to support it." Liquids are worn by many rockstars (including Sammy Hagar), sports athletes, military and law enforcement. We are proud to offer this unique line, and at discounted prices. Treat yourself to the best sunglasses you'll ever own. Liquids look fantastic and are mare made of unbreakable, hingeless aluminum, which makes them virtually indestructible!