DURABLE WITH ABS CONSTRUCTION, the rings are made of high-density ABS for ultimate durability and security (load capacity up to 1,760 lb.), the threaded rings ensure outstanding comfort while making sure there is zero slippage even when sweating ADJUSTABLE FOR DIFFERENT NEEDS, the 2 rings are secured by premium polycarbonate nylon straps with adjustable buckles (adjustable up to 15 ft.), and the buckles come with teeth for improved load capacity as well as safety, fully accommodating different users and spaces EASY TO INSTALL, specifically designed and manufactured so that all users can easily complete installation in less than 5 minutes, just hang around any solid piece of wood or steel, slide in the sling underneath the buckle, and find the appropriate strap length for you, then you are good to go!