This Ride Safe Motorcycle Hand Wave Reflective Decal can be applied to any smooth hard surface like plastic, metal or glass. The Biker 2 Fingers Signal Sticker is is available in 8 sizes, from 3" high to 10" high. This Reflective Biker Salute is cut from Genuine 3M, Automotive Grade, Retro Reflective Safety Vinyl. This is the same reflective decal material used on police cars and fire trucks. They look like regular decals in the daylight, but at night they glow under flashlights and headlights.