All of Fab4Pets' leashes are made with Mighty Max Super Rubber™.  This is the strongest, most comfortable shock absorbing material on the market guaranteed!  Mighty Max Super Rubber™ is made of over 200+ strands of   hydrogen bonded Level 5 polymer chain rubber, providing the most durable and comfortable way to walk your dog. The leashes have gone through rigorous testing and have surpassed the 2500 lbs. pull weight.  Unlike hollow core construction shock absorbing leashes, EZ Steps™ and Dockdogs™ Freestyle shock   leashes consist of Mighty Max Super Rubber™, making for a stronger and safer way to walk your dog.  Hollow core leashes can pose a safety threat to the dog if the rubber tears or rips, leaving the dog at risk.  We invite you to try the very best in shock absorbing leash technology.