Patented Swivel Bearing System is replaceable for your Buddy Lee's Hyperformance Jump Ropes (Aero Speed, Rope Master and Junior Speed);Swivel bearings are designed to eliminate friction and drag, prevent rope tangle and provide ultra fast and smooth turning action with control in all directions;Hyperformance swivel bearings will wear quicker than conventional jump ropes and are designed for great performance, but the durability may vary based on personal use and care;The life of the swivel bearings can range from 6 months to a year before replacement;Jump rope sold separately