StillCool Hands Free Leash Bicycle Exerciser Dog Leash with 550-lbs pull strength Paracord Military Grade Lightweight and very Affordable Bike Exerciser Leash for all Dogs. Prevents dog from becoming entangled in wheel or frame Lets you safely walk your dog and ride your bike at the same time Length of Leash is Adjustable Can add 6.5 Inches by taking out 2 springs inside the Steel Wand that will allow extra leash length Adjustable internal spring system for varying degrees of pullers. Greatly reduces shock from dogs that lunge or pull for a stable ride High Carbon Stainless steel for strength leash installs on virtually any bike in under 5 minutes Only True Quick Release Bike leash Patented design Warranty: 30-Day Money Back Guarantee and 12-months Replacement Warranty.