Buddy Lee Swivel Bearing System 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