We have developed the 4K Booster Ball, 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 & all our new DOABLES. The Booster is a hybrid towing system for more effortless towing of inflatable Doable/towables. Material: Sturdy PVC with Nylon Cover. Size: 18,3m. Additional Features: max. tensile load 1864kg. Colour: Red/Yellow.