PLEASE REMEMBER that the single color decals are DIE CUT. This means that the middle sections are transparent. Whatever surface you apply them to will be seen through areas of the decal.Decals that have full designs inside are not Die Cut and cover the area that you apply them to. Our decals are available in sizes from 2 Tall (Helmet/Hard Hat Size) up to 34 Tall.The standard size for a helmet or hard hat is 2 tall and reflective material.The standard size for window decals is 4 non reflective material. They are printed on the best 3M Non-