The White Knuckle The Swerve Towable Tubes are the perfect way to enjoy a day on the water. These tubes can accommodate up to 3 riders and come with 8 handles for a comfortable grip. The knuckle guards on this tube provide extra safety while riding. The EVA padding on this tube ensures a comfortable ride. The cover on this tube is made of high quality 840D nylon. The bladder on this tube is made of 28 gauge PVC.