Retractable Dog Leash extends up to 13 ft, The use of nylon cord material provided by the supplier of automotive safety belts ,strong and durable, For any types of dog with up to 55 lbs in weight, This Retractable Leash works for powerful large dogs, as well as medium sized and smaller dogs, giving them maximum freedom while under your control. Safe And Reliable Brake System: One Button Break to lock .When the brake button is pushed, the retractable leashes instantly stops and is securely held at exactly that length.a perfect spring for smoothly retracting dog leash while you will not hurt yourself.