The 31-20096 Encore Frame Laser Safety Glasses by Honeywell (formerly Sperian) are for ND:YAG, , Holmium, Erbium, and Telecom laser wavelengths. It has a Encore frame with light grey color glass lenses. Uvex's Laminated Glass Technology (LGT) eyewear is designed to withstand direct laser radiation for short durations while providing excellent field-of-vision lenses with multiple wavelength coverage. 75 % VLT (visible light transmission). Encore frame is comfortable over-the-glass spectacle with an adjustable earpiece length, and has a good side shielding. This model is CE certified. Meets ANSI Z136.1 and EN207.