Sportsstuff Custom Tow Rope - Booster Ball Towable Sportsstuff 4K Booster Ball 502414 The Booster Ball is a custom tow rope with inflatable buoy in the middle that will boost your towable performance in many ways. It keeps the tow rope out of the water while towing. This enhances the overall performance of most towables and all the Action tubes. Reduces drag, rope spray, submarining, lowers stress on the tube and cover and prevents rope spray. For use with 1-4 rider towables.