Guiding Star 2016 Newest Model Hands Free Dog Bike Exerciser Leash Dog training leash by High Carbon Stainless steel for strength leash; Very easy to install and controlyou just pay 5-10 minutes for finishing installation; There is an internal shock-absorbing system ,quickly lock and release capability for easy switching; Avoiding much danger from tying your pet too close to your bike; Very easy and relaxed for you to walk your dogs.