The ZUP Duo is an exciting deck tube that your family will love to have behind the boat this summer. Constructed from K-80, .66mm PVC, the Duo is easy to board with the convenient grab handles towards the back of the tube and is a FUN towable for people of all ages. The 420-denier nylon cover is durable and will provide long-lasting use. The Duo towable tube will hold 1 adult or 2 small children. The Rope ZUP Tow Assist ball does just that...keeps the tow rope UP. Can be used on towables with capacities up to 4-riders. By keeping the tow rope out of the water, you reduce drag and increase gas mileage on the boat...That’s whatZUP! Reduced drag also enhances tube performance on turns and slides. The oval shape of theRope ZUP allows the ball to rotate freely in the water and absorb shock on the rope