CLENS LENS PROTECTION FOR FLASHLIGHTS AND WEAPON LIGHTS Lights only work well when their lenses are clean. Each CLENS Protector provides an easy way to protect lenses during extended shooting sessions. Just like goggle tear-offs for off-road riding, just remove the dirty CLENS to return your light to its optimal brightness. CLENS (pronounced "cleanse") come as a set of heat-resistant clear polymer circles, cut to fit on a wide range of flashlight and weapon-light lenses. Each CLENS Protector protects the lens from carbon and other debris that can build up during firearms training. Each CLENS Protector has a small tear-away tab. The CLENS Protector Mfg: Thyrm Llc