The 4K Booster Ball is an inflatable buoy with tow rope connected to both ends, as a way of keeping the tow rope out of the water the majority of the time while towing. This enhances the overall performance of most towables. The Booster is a hybrid towing system for more effortless towing of inflatable Doable/towables. Key Enhancements Reduces drag and acts like shock absorber, enhancing fuel economy Less stress on tube and cover Great for low transom tow points Reduces rope spray Higher visibility of tow rope in the water Tow rope is less likely to get caught in water or boat wake, especially in turns Features Enhances the performance of all Doables and most regular towables Heavy-Gauge PVC Bladder 840 Denier full nylon cover with zipper Tough 2 Inch webbing Exclusive patented speed safety valve 60 foot overall length (including booster ball) Double stitching and reinforced stress points Self bailing drain vent 4k tow rope 4100 lb. break strength Designed for 1 to 4 person towables