The TPWOD High Performance Bumper Plates are made from recycled material and through specific molding techniques, have been developed to be one of the toughest training weights available today. The weights are solid rubber and feature a stainless steel sleeve in the center for proven durability. These plates offer the best shock absorption in order to preserve the integrity of bars and flooring. 10lbs plates are the same 45 cm (17.7 in.) diameter as the heavy plates.