Made of rubber with a stainless steel insert, the ETHOS(R) Olympic Rubber Bumper Plate is less noisy than traditional iron plates with minimal bounce for added safety. CLANG-FREE CONSTRUCTION: High quality vulcanized rubber design lets you lift and drop without damaging your floors Less noisy than traditional iron plates with minimal bounce for added safety Stainless steel inserts slide on and off weight bars with ease Peel, chip and bloom-resistant for long-lasting use Designed for use in conjunction with a barbell for a variety of strength training movements