Fox American Optics Air Force Pilots Genuine GI Sunglasses, Matter, 52 MM Frames Made From Steel Alloy Material. Temples Frames Are Bayonet Style. Scratch Resistant & UV Protected Lenses. Offical US Air Force Pilot Sunglasses. CE/EN 1836:2005 Compliant. AS/NSZ 1067:2003 Compliant. ANSI Z80.3-1996 Compliant. Comes In Three Different Sizes To Fit Perfectly: 52 MM, 55 MM, 57 MM. Made To Withstand Rugged Use, Made In USA By A Government Supplier American Optics