AO Eyewear Original Pilot Sunglasses 55mm Matte Chrome Frames with Bayonet Temples and True Color Grey Glass Lenses (OP52M.BA.TC) Performance-tested sunglasses with classic aviator styling. The Generalhas been a favorite of U.S. military pilots for more than 50 years. Matte Chrome frame with bayonet temples for added comfort; AO original soft case included; Frames measure 52mm; Calobar Green Glass lense. Pure and polished, distortion-free optical glass lens chemically toughened and hardened for impact and scratch resistance. 98% UVA/100% UVB protection;