The high quality: The ball tensioner is made of high quality nylon, rubber and plastic ball. It is durable and friction resistant. It has great tension to fix the tarpaulin properly. Tarpaulin tensioner is suitable for tents, posters, pavilions, trampolines, mesh , PVC banners, it has great tension to fix the tarpaulin properly.< /p> Reusable: rubber ball tensioner can be attached and removed in seconds. Plastic and rubber have high weather resistance. Adjust the length of the rubber by moving the knot. 30 pieces Cable length is 150mm/5.9inch. The extreme expansion length is almost 300mm/11.8 inches. How to use - It is easier to use this ball stretcher than others. Just thread the rubber cable through the hole and place 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. Product Description Elastic tensioner for banner, tarp, pavilion, tent, curtain extension harness, tarp support, durability and friction resistance. It has great tension to secure the tarp properly. Useful for multiple daily uses, very easy to use tensioner. The attached tent lines can be attached and removed in seconds without additional tools. No unnecessary cutting of already mounted cable ties, The clamps can be reused at any time. Specification: 30 pieces Set Length: 30 pieces 150mm rubber clamps Materials: Ball stretcher is made of white nylon, rubber and high quality plastic ball.