MATMATERIAL: Overlord Fitness bumper plate Made of 100% high density natural rubber for long lasting .Minimum drop test 8000-10000 times. The material of the bumper plate is relatively soft, having a good feel. Smooth and delicate surface, more texture. When loading and unloading, you do not need to worry too much about clamping your hands and smashing your feet to ensure safety. The floor material requirements are low. Low bounce and high durability of the weight plates effectively protect the floor and barbell bars.