The 3M Virtua standard safety glasses are made of polycarbonate, are packaged 20 per case, come in mirror clear and meet ANSI Z87.1-2003, CSA Z94.3 standards. These types of parts are designed for specific applications which feature ways of safeguarding & shielding itself and/or the user. This SKU is designed and manufactured such that it offers the following protection: Impact-Resistant, Scratch-Resistant, UV-Protective. Provides 99.9 % of UV Protection.