The Bike Balance "Extreme" leash is designed to replace the standard leash in the Bike Balance Dog Jogger Kit. This leash is constructed out of high quality polypropylene rope with an elastic cord braided in the middle. It offers unsurpassed durability and strength while maintaining unique stretchability. The re-enforced swing boom connection makes leash breakage nearly impossible. Ideal for bigger/stronger dogs. Warning: Riders should use extreme caution when using this leash. Extreme caution should be used due to the nature of this product. Death or injury could occur. Installing this item will void any previous warranty on your Dog Jogger. Includes leash, swivel hook and new swing boom plug/pin.