AIRHEAD BOB Booster Ball
What about BOB? BOB is an advanced 4 rider tow rope with inflatable buoy in the middle that will boost your towable's performance to a whole new level. It keeps the rope out of the water while towing which reduces drag, rope spray, and submarining. This 60 foot long advanced towing system (including ball) has a 4,100 pound break strength.
BOB features a heavy-duty full nylon cover, self bailing drain vent, and patented Speed Safety Valve for fast and easy inflation and deflation.