The 31-80170 GPT XC Spectacle Frame Laser Safety Glasses by Honeywell (formerly Sperian) are for the Nd:YAG laser wavelength with OD8 attenuation. It has an XC frame with green color polycarbonate lenses. 45 % 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 and EN207. CE Certified.