Material: The main body is made of high-strength and wear-resistant ABS plastic. The bottom is equipped with high-quality PE soft rubber mats to prevent marks on the wall. Wall Protection: The wall protectors are designed to protect your walls, doors, and stairs when installing baby or pet gates. No tools are required for installation, easily protecting walls, doors, or stairs. Non-slip: The soft rubber pad is non-slip and adheres to the wall to prevent the door from sliding. When your cute pet bumps or the baby shakes it, you no longer have to worry about the door moving. Multifunction: The child safety door buffer cups are used in many types of pressure doors, such as: child gate, baby safety gate, baby gates, baby gates for stairs, pet gates with door, baby gate tensioner, child gates, shower tension rod, etc. The wall-mounted shower curtain rods can be used for shower curtains with tension hanging rods. Upper circle diameter: 8 CM; inner circle diameter: 4 CM, so be careful that the screw tip does not exceed 4 CM.