High Quality: The 4 sets of shock absorbers are made of high quality rubber and eco-friendly PP (polypropylene) for excellent durability. The bottom layer is made of rubber, which has friction, anti-slip and soft properties. The double design protects the floor from damage when moving, shaking or walking. Anti-slip function: The damper can reduce the noise caused by the instability of the washing machine or dryer. Greatly reduces the transmission of washer/dryer vibrations to the floor, preventing scratches, nicks and abrasions. Protect appliances from scratches and protect your floors. Inner Diameter: 4.7cm; Shock absorber suitable for most brands of washing machines and large household appliances. Install the equipment in place and reduce noise. Easy to install: No tools or stickers required. Simply lift each corner of the machine and slide the shocks into place. Versatile: Each cushion can be stacked to meet different height requirements. Suitable for washing machines,