This is one 3M reflective 2" helmet tetra decal sticker. It is designed for use on helmets, windows and other surfaces and is printed on a high quality engineer grade vinyl. Under normal condtions this decal should last 5 to 7 years. You also have the option of purchasing a package of 8 helmet tetras by selecting the 8 pack option, shown below.
Clean the surface where you place the decal with real rubbing alcohol and dry with a clean cloth. DO NOT USE an alcohol pad. Be careful when applying the decal as the adhesive sticks quickly and the decal cannot be re-positioned. For vehicle glass or other outside surface, the temperature of the surface should be in the range of 50 to 70 degrees. Extreme temperatures will keep the decal from sticking properly. Wash decals with warm water and gently wipe the surface with a clean cloth. Harsh soap, wax, and water repellent products will destroy the decal.