UTG Five Color Switchable Flashlight Lens Filters, 42mm Dia UTG Illumination Enhancing Color Lens Filters Includes a 42mm Diameter Tube Cap and 5 Removable/Translucent Color Lens Filters RUBY - Preserves Night Vision, AMBER - Cuts Through Smoke EMERALD - Best Clarity Under Low Light Conditions, SAPPHIRE - Easy to Trace Blood Trail CLEAR - Better Focus of Light Beam