Sportstuff 53-2030 Booster Ball Booster Ball Towing system designed to enhance the performance of one to four-person towables System includes 4K Booster Ball and custom tow rope; overall tow length of 60 feet with Booster Ball Heavy-gauge PVC bladder; heavy-duty full nylon cover; reinforced tow system Patented speed safety valve for fast inflation and deflation Hybrid system reduces drag, absorbs shock, and improves fuel economy