Inflatable booster ball for towable tubes. Good condition and no holes. We sold the boat so we no longer need this. The Sportsstuff Booster Ball is an inflatable buoy that will boost your towable’s 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. It reduces drag, rope spray, submarining, lowers stress on the tube and cover and prevents rope spray.