Easy to remove without leaving marks or sticky residue on your walls. Bring you a convenient experience. Wipe wall with rubbing alcohol, keep it dry and clean. Quantity: 36 pairs (72 pieces). The wall hangers are simple and convenient to use, just need to clean and dry the surface of the object, then peel off the protective film from the sticking side and stick it to the back of the item; stick the other side on the wall and wait for 24 hours to hang thing.