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: Wall guards are designed to protect your walls, doors and stairs when installing baby or pet gates. 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 don't have to worry about the door moving any more. Multifunction: Child safety door bumper cups are used in many kinds of pressure type doors, such as: child door, baby safety door, baby gates, baby gates for stairs, pet gates pet carrier with gate, baby gate tensioners, child gates, shower tension rod, etc. Wall pans can be used for shower curtains with tensioned attachment rods. Top circle diameter: 8CM; inner circle diameter: 4 CM, therefore, be careful that the end of the screw cannot exceed 4 CM Number of shipments: 4 pieces