Acid free - Self-Adhesive - High-Gloss Plastic Finish!These colorful, fun stickers give practical study information to reinforce basic language and math skills. Each sticker is 4" X 4". Stick them on a desk top or stick them in a notebook or folder. Perfect reference guides to reinforce what is being taught. 20 stickers.20 full-color stickers Each Sticker: 4" x 4"; Pack: 4.5" x 7", shrinkwrapped with butterfly hole