The Mighty Mini Super Slip Leash is assembled by hand in the U.S.A. from 7mm anchor cord. This is the same cord that climbers use, and it is incredibly strong and durable.The loops at either end of the leash are created with industrial aluminum clamps that are applied with a 3 ton compound press. We cover the clamps with heavy-duty heat shrink tubing for a clean look. All Mountain Dog Leashes come with an unconditional lifetime warranty that even covers chewing.