Our bass drum stickers are printed on 12 mil satin polypropylene. They are removable and reusable so you can easily swap them onto other plastic drum heads. The bass drum sticker sizes that we offer are 18", 20" and 22" but they will be printed slightly smaller to ensure an easier fit to your drum head. For instance, if you order a 22" bass drum sticker, the sticker you receive will actually have a diameter of 21.5".