Our vinyl decals are printed on high-quality air-release vinyl. No old adhesive here! These things stick to just about every surface when applied properly. We suggest cleaning the surface with a little rubbing alcohol before applying and following the included instructions to ensure a bubble-free placement. Our decals all come with a carrier layer as well! This is a clear layer on the face of the decal that helps to place it exactly where you want it! Just peel the decal off the backer, place it, push it down being sure to work from the middle out towards the edges, and carefully peel back the clear carrier layer. Our decals can also be removed fairly easily from most hard non-porous surfaces (i.e. metal, glass, plastic) if you warm them up with a little heat from a hair dryer (on low setting, not more than 5-10 secs of heat) and peel slowly. Most of the time they will come off clean with no residue!