Renton In Renton, sizeable round lenses meet a slim acetate frame—accented with a subtle keyhole bridge, flared end pieces, and Graduated Rivet design. - Color: Black Oak Tortoise - Made from hand-polished cellulose acetate - Akulon-coated screws for durability - Prescription lenses are made from polycarbonate, the most impact-resistant material for sunglasses; non-prescription lenses are made from CR-39 for maximum clarity and color - Includes scratch-resistant lenses that block 100% of UV rays