The Glassworking Safety Glasses – BoroTruView 3.0, Model 33 has a polycarbonate navy glassworking lens that provides excellent colour recognition for borosilicate glass and furnace work. These flameworking glasses offer excellent UV blocker, excellent IR protection, excellent sodium flare blocker, and excellent clarity. Recommended for those who work with lampwork or hot glass in small pieces. These lampworking glasses 33 have a durable and lightweight fitover frame made of high-quality plastic. The 33 lampworking glasses feature adjustable temples and integrated side shields. These Phillips Safety lampworking glasses are available in black.