Nylon's elastic effect increases pulling force. Cordura reinforced eyes attach quickly and easily to frame member, hooks or trailer hitch. Shock absorption reduces risk of damage. Made from durable heavy duty nylon. No dangerous metal parts. Weather resistant - resists rot and mildew. Lightweight and flexible for easy use and storage. Made utilizing the same heavy-duty nylon webbing and rigorous manufacturing system used to make lifting slings for industry and construction.