Acid free - Self-Adhesive - High-Gloss Plastic Finish! These colorful, fun stickers give practical study information to reinforce basic language and math skills. Stick them on a desk top or stick them in a notebook or folder. Perfect reference guides to reinforce what is being taught. 20 full-color stickers per pack. Each Sticker: 4" x 4"; Pack: 4.5" x 7", shrink-wrapped with a butterfly hole. Sold as 3 packs for a total of 60 stickers.