Designed to keep the rope out of the water, the Shock Ball from O'Brien reduces drag for better performance on turns and slides while also improving gas mileage. The oval shape helps absorb shock. Use on up to 4-person towables. Lightning valve allow fast inflation and deflation times. Adjustable line lengths at 50', 55', & 60'. 41" x 22" (deflated). Helps improve gas mileage Oval shape helps absorbs shock on the rope Adjustable Line Lengths - 50', 55', & 60' | O'Brien Shock Ball