Tired of fumbling with that hex key to put on and take off your metal ball stretcher? You no longer need to worry about hex keys. These weights use magnets for locking. The rounded edges and smooth steel feel great. They can be easily attached and removed with a strong magnet, eliminating the need for screws and internal hex keys. Powerful magnets secure this ball stretcher and keep it nice and safe. You'll definitely feel the pull when you walk around.