Also suitable for the most powerful dogs, the ZippyPaws CLIMBERS Mountain Climbing Rope Dog Leash is made of real mountain climbing rope. The length of 6′ (1, 8m) is great for walking and training in general – Made with real mountain climbing rope – Tensile strength of over 3000 pounds (1360kg) – Extra strong 2/3′ (17mm) rope is thicker than normal leashes – Unique fabric design is comfortable to hold – Durable carabiner for heavy loads.