These Olympic Rubber Bumper Plates are simply fantastic, designed to provide excellent flooring protection with a 2" reinforced centre sleeve for easy loading. Premium quality suitable for full commercial use in Olympic lifting, Powerlifting, Crossfit and all other heavy duty environments. Please note; 5kg bumper discs are not designed to be dropped on their own. If using in an environment that involves dropping weights, then they should only be used with heavier weight discs.