Our custom made biothane lines are made from high quality material. Incredible breaking strength. Biothane is a unique strap that contains a nylon twill inside it. The leather type feel is soft on your hands, resistance to expanding and works excellent in wet conditions. Our brass and stainless hardware allow our leashes to survive harsh environments. Large hand hold with a unique sewn in D ring to allow you to clip the leash back on itself for slinging applications over yourself.