Code 4 safety glasses Clear lenses Black frame Scratch-resistant polycarbonate lenses Ribbed, non-slip rubber nose cushion Contoured temple tips for precise fit Hinge-stops help prevent lens damage Lightweight (weighs less than an ounce) Meet ANSI Z87.1+ impact standard 99.9% UV protection S&W logo on temple Polycarbonate safety glasses protect your eyes from impact, but the glasses deteriorate due to scratches, light, etc., and should be replaced after 2 years.