When you're out on the lake pretty much the only thing that can put a damper on your tubing experience is a rope that sinks. Eradicate frustration this summer with the Obrien 2 Person Floating Tube Rope. Ideal for 1 and 2 person tubes, this highly durable rope is constructed from 60 filament polypropylene and has been tested to 2,375 lbs. Best of all, it floats.