Riders experience brief surges of speed as the bungee stretches and contracts 9/16 inch x 3 foot polypropylene rope stretches to 5 feet Bungee Tube Rope Extension attaches between your boat's tow point and the tube tow rope Reduces wear and tear on tubes and riders by absorbing sudden jerks from slack in the line 4,150 lb tensile strength is perfect for up to 4 rider tubes