"The Super Mario Bros. Removable Wall Decorations were a terrific accent to our son's birthday party. I was doubtful that they would really stick, but they did. They're made of a durable vinyl-like material, that made adhering them and taking them off a breeze. After the party, we saved them, and used them to decorate his bedroom. (They didn't go back to their original sheets, but even when they stuck to each other upon removal, they easily unstuck, and could be used again.) Great purchase!"