RollerBones Art Super Elite 101A Competition Roller Skate Wheels (Set of 8) Roller bones team wheels have proven competition shapes poured in a high rebound, easy to ride, medium hard, long-lasting formula Featuring competition winning, high performance urethanes, hot cast around a high-strength, fiberglass-filled, high-rebound, precision-molded hub The resulting roll is unsurpassed, bearing life is extended and the response is even quicker than before