Top quality dog tie outs made of durable yet flexible steel airline cable, with a smooth weather resistant coating. The tie out has a strong large hook on each end with a heavy duty spring on one end for your pets safety. For large dogs 30 to 100 lbs, with a cable strength of 1700 lbs. The tie out will work tied around a tree, with a ground level stake or a dog trolley (sometimes referred to as a tree trolley or dog run).