These suctions cups will stick on any smooth, non-porous surface. Use them in the office to hang ID cards, keys, or signs. At home, they're handy for hanging eyeglasses, toys, or awards, or even in the shower to hang your loofah! Teachers find them handy in the classroom for displaying artwork. You can also use them to hang documents, safety goggles, and other items. Each hooked suction cup is 1 5/8 inches in diameter. This item comes in a display box.