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 length of the cable is 200mm / 7.9inch. The extreme expansion length is almost 400mm / 15.7 inch. 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. In the title and description, we have provided the details of the product, including its features and specifications, please pay attention to the size and dimensions of the product to ensure that it meets your needs. We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please feel free to contact us. We are here to help and will do our best to help you.