Built from high-strength stainless steel, adjustable bungee cord extends 30 inches max. Easy installation/removal. Can be easily disconnected from a bike by screwing and unscrewing in seconds. Compatible with any kind of bike. Hassle free detach system allows you to unscrew the leash effortlessly, after initial installation, and serve as a walking leash. Patented design includes an internal shock-absorbing system allows you to maintain control while riding without the effects of your best friends sudden jerking movements. Dissatisfaction within 30 days can be 100% refunds. When you first use it, walk a distance to get your dog to adapt.