Our bumper plates are made from high-quality rubber, with high styrene content, the rubbers are harder and less rubbery so that they shouldn't bounce back up. These bumper plates are versatile have the perfect level of bounce to maximize your workout effect and can withstand thousands of drops. High impact resistance even when dropped from overhead. They provide a stronger, dead bounce bumper plate for those demanding the highest quality and performance. Each plate is color-coded to provide easy identification and a long-lasting engraved marking of the weight size. These bumper plates are versatile and have the perfect level of bounce to maximize your workout effect. All weights have the same consistent diameter to maximize surface area when they are dropped. Bumper plate measurements All the plates of the same dia 17 3/4 inches Long 10 lb. thickness 1 inch 15 lb. thickness 1 ¼ inch 25 lb. thickness 2 inches 35 lb. thickness 2 ½ inches 45 lb. thickness 2 ¾ inches 55 lb. thickness 3 ½ inches 160 lb. Set Includes: 2 x 10 lb. , 2 x 25 lb. , 2 x 45 lb.