Description Durable lightweight material is corrosion resistant and flame retardant Clear vision both prior to and during welding for safety and higher work efficiency and quality Protects against ultraviolet (UV) and infrared (IR) radiation Automatic shut-off saves batteries Complies with DIN, ISO EN379 and ANSI Z87.1 standard 3.85" x 1.70" viewing area Switching Time: Light to Dark 1/30,000 of a second (0.0000.33 sec.) Replacement Lenses: Part #41261 Replacement Headgear: Part #41263