Olympic Bumper Weight, Rubber Plate with 2-Inch Steel Insert Rubberized Weightlifting Barbell 22714323Product Features Construction: Made of 100% high density rubber, each bumper plate has an inner ring with a diamter of 2"(IWF standard), fits any Olympic barbell or dumbbell bar with a 2inch diameter. Ultra quiet design: Solid rubber construction, steel inner hub designed to withstand repeated drops and with minimal bounce, reduced noise of bumpers considerably, not only protect the floors, but also protect your bars. Multi function: Great for muscle