Grey Polarized Lens: Visual Light Transmitted (VLT) 11%. Cat. 3. Base tint is a neutral grey color - best suited for brightest light conditions; Protects from harmful HEV light (98%) & UV (100%) while delivering eye relaxation and accurate color perception; Premium scratch resistance & impact protection lens; 6 Base lens curvature; Crafted from hand-polished M49 Bio-Acetate produced by Mazzucchelli; Optical grade 5 barrel stainless steel hinge for strength; Teflon coated hinge screws for durability; Custom heat tempered wire temple inserts for fit and strength; 50mm H - 138mm W - 138mm L; Weight: 40g