Airhead Bungee Dock Lines absorb shock to boats, cleats, docks, pylons and other hardware. The bungee cord is hidden inside the rope and acts as a built-in snubber. The foam floats protect the boat from chafing. There?s a sliding adjustment at both ends for quick docking. Recommended for docking boats and PWC?s up to 4,000lbs. Tensile strength is 2,500lbc.