Devardi Glass Didymium Safety Glasses for Lampwork, Beadmaking, Black PT-1 Aero-Pro Optics Didymium Glasses - Black Frame Glass Lenses, high impact plastic unisex frame. For soft glass torch applications. If you use boro glass, add our #3 green flip up for added protection, sold here on Amazon. For reducing sodium flare and UV light from soft glass torch applications. Superior grade Didymium GLASS lenses. Flat lenses eliminate distortions. The frame in the front corner to corner is 5.5 inches. The height in the front is 1.5 inches. The lenses themselves are 1.25 inches high x 2 inches wide. Please click the blue "Devardi Glass" above to see all our listings.