Sticker Congratulations are self-adhesive stickers for decoration. They are made of polyethylene protective. The best characterize sticker for kids on decorating different items. By peeling and sticking the stickers, children use the small muscles in their fingers and hands which helps to improve their dexterity. Strong intrinsic hand muscles are necessary for tasks such as coloring, holding a pencil, tying shoelaces and managing buttons on clothing.