Gunmetal accents blend with the matte finish of the dark Italian acetate to give the JS Jack Black the versatility of an iconic and traditional black frame. Polarized gray lenses keep the overall design consistent and complete the classic look that goes with any style. The frames are crafted from high-grade Italian cellulose acetate, and each frame is individually hand-polished and assembled. German-engineered 5-barrel hinges and screws are used to retain smooth movement for years to come, and a wire core extends from hinges to support temple shape. Our lenses are made from an impact-resistant CR-39 that provides incredible durability and exceptional visual clarity. Polarized lenses come standard, and all lenses include optimal protection by blocking 100% of UVA and UVB rays. Lenses also have an anti-scratch hard coating to reduce damage and an anti-reflection coating to reduce glare.