CafePress - Koi Mermaid 20x12 Wall Decal - 20x12 Wall Decal, Vinyl Wall Peel, Reusable Wall Cling Wall Decals are printed on heavy grade vinyl with a unique adhesive which allows the decal to be removed and re-applied multiple times. Perfect for dorm rooms, kids rooms, doors, and more. Measures 20" x 12". Won't hurt walls. Can be moved and reused.