The shock absorbentBartman dog leash is part of the exclusive + The Simpsons collaboration. This Ruff leash It comes with a sturdy super hook that includes an easy-to-use locking screw for extra safety. The polyurethane spring absorbs shocks when your dog pulls during walks. The small Ruff leash is longer and ideal for smaller dogs while the large Ruff leash is shorter to better control bigger and taller dogs.