4 Rider Tube Rope: The 4k Safety Tube Rope is a 60 foot long rope designed for 3 or 4 rider tubes or 4,100 pounds of average tensile strength. It has a maximum of 4 people or roughly 680 rider pounds and is a great mid-weight rope for average tubes and tubers. It is safer because it reflective and has a neoprene core so the whole rope floats.