LenzFlip Replacement Lenses for Ray Ban Erika RB4171 Sunglass - Multiple Colors plastic frame plastic lens polarized Lens width: 53 millimeters PRECISION CUT FOR ERIKA FRAMES. Crafted using state of the art edging (cutting) equipment that utilizes laser guidance to craft the lenses to the right dimensions and size, ensuring a perfect fit for the frames POLARIZED LENSES. Polarized lenses eliminate 100% of glare-causing horizontally oriented light, providing crisp and clear vision through the lens SCRATCH AND IMPACT RESISTANT POLYCARBONATE. Made from 100% polycarbonate material of the highest optical grade, providing superior scratch and impact resistance with outstanding optical clarity 100% UV PROTECTION. Lenses have UV protection built within the polycarbonate material itself, providing complete protection from harmful UV rays that never wears off Please note these lenses are polycarbonate and not glass/mineral lenses which makes them lighter and impact resistant compared to most original Rayban lenses. These are aftermarket lenses produced by LenzFlip and will not have "Ray-Ban" on the lens You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it! Scratch Resistant Exterior Coating Optical Quality Polycarbonate with 100% UV Protection High Efficiency Polarized Film Optical Quality Polycarbonate LenzFlip lenses provide the user with 100% protection from harmful UV rays that can damage the eyes over time leading to cataracts, wrinkles, macular degeneration and more. All lenses have UV protection built within the polycarbonate material itself, providing the user lasting UV protection that never wears off. There are several tests you can do to find out whether or not your lenses are polarized. The easiest is to hold one lens in front of the other and while looking through both of them, rotate one. At a certain angle they will black out, blocking all light transmission. Although our lenses do not have the words &#034;polarized&#034; etched into them, they are 100% polarized if advertised as such. To clean your lenses, do not use chemical cleaners or rough cloths. You can use the provided microfiber cloth to ensure the lenses will not become scratched or damaged.