The Super Hero of Plate Weight - Absorb the force and protect your floor all while looking stylish Each bumper plate is fitted with a metal sleeve for proper fit and easy sliding.. Rubber bumper plates are solid, high quality, resilient rubber (no crumb rubber used). All plates are standard diameter- 18" Insert type: Stainless Steel Available In: 15, 25, 35 and 45 lbs. plates * Plates sold individually