Material:Door Stoppers is made of zinc alloy and rubber,strong,durable and rust-resistant and can be used for a long time Shockproof and Silent:Rubber stopper gives silent effect and resists bumping to protect the door, window, lock, wall or glass etc, without noise to sleep well Easy to install: Simply install the triangle at the best height behind the door, then drill the three pilot holes in the door, tighten the screws to use it Multifunctional: The movable door file helps to keep the door open and maintain the air while helping to reduce the noise generated by the swinging of the door Packaging and Size: 2 Pieces Door Stoppers and 6 Pieces Screws.