The 31-80155 XC Frame Laser Safety Glasses by Honeywell (formerly Sperian) are for Nd:YAG, 532 nm Alignment laser wavelengths. It has an XC frame with light tan color polycarbonate lenses. Glendale's polymer Diffused Viewing Only (DVO) designed eyewear maximizes visibility, with lightweight frame designs while providing unsurpassed attenuation for the entire range of laser wavelengths. 40 % VLT (visible light transmission). The stylish XC (extra comfort and extra coverage) frame provides the best wrap around coverage for a spectacle and most comfort for the wearer. The lenses are coated for anti-fogging. The insert for prescription lenses is available free of charge by contacting Honeywell at 1-800-500-4739. Meets ANSI Z136.1, EN207, and EN208.