Product Description Package content: 50 * rubber band tensioner 1. Our tarpaulin tensioner is made of high quality Nylon, rubber and plastic ball. durable and wear-resistant, Long time of use. 2.It is easier to operate this ball elastic tensioner than others, just pull the rubber cable through the hole and put it on the ball, this elastic ball tensioner has the best strong elasticity. 3.The length of ball turnbuckle contains 50 pieces, the cable length is 150mm / 5.9inch. The extreme expansion length is almost 300 mm / 11.8 inch. 4.Easy to use black elastic tensioner: It is easier to operate this ball tensioner than others, just pull the rubber cable through the hole and put it on the ball. This cable has the best strong elasticity. Don't worry about your thing being so big that the cable will break. 5.Widely use: for curtains, pavilions, trampolines, banners, Fixed swimming pool cover, Garden greenhouse cover attachment, Truck cover attachment.