The Extreme Bungee Shock absorber is a perfect way to build drive and cushion the impact for your dog when working on a harness or collar. Use for either on leash work to build drive or cushion your dog during the barking and biting phase. The Extreme Bungee Shock absorber can also be used to attach to the end of your back tie or posting line. The Extreme Bungee Shock absorber has 2 bungees inside the webbing which makes it a much stiffer and takes a much harder effort on your dogs part to spring into the bite, helps to create fast hard bites in protection work. You can also use our Standard Bungee Shock absorber for a lighter bungee shock absorber, the standard bungee shock absorber is not intended for back tying or post work. The Extreme Bungee Shock absorber is 18" in length and will stretch to approximately 28"