Description Material: The main body is made of high strength and durable ABS plastic. The bottom is equipped with high quality PE soft rubber mats so as not to leave marks on the wall. Prot Wall Guard Protector: The wall guards are designed to protect your walls, doors and stairs during installing gates for babies or pets. No tools required for installation, easily protect walls, doors or stairs. Non-slip: The soft rubber pad is non-slip and clings to the wall to prevent the door from sliding. When your cute pet knocks or the child shakes it, you dont have to worry about the door moving any more. Multi-function: The child safety door bumper cups are used in many kinds of snap type gates, such as: child gate, baby safety gate, baby gates, baby gates for stairs, pet gates with door, tensioner baby gate, childrens gates, shower tension rod, etc. The wall pans can be used for shower curtains with tensioned fixing rods. Diameter of upper circle: 8 CM; inner circle diameter: 4 CM, so be careful that the end of the screw cannot exceed 4 CM