The high quality: Ball tensioner is made of high quality nylon, rubber and plastic ball. It is durable and friction resistance. It has great tension to firmly fix the tarpaulin. Tarp tensioner is suitable for tents, posters, pavilions, trampolines, mesh banners, PVC banners. It has great tension to fix the tarpaulin firmly. Reusable: rubber ball tensioner can be attached and removed within seconds. Plastic and rubber have great weather resistance. adjust the length of the rubber by moving the knot. 30pcs the cable length is 150mm/5.9 inch. The way to use - It is easier to use this ball tensioner than others, just pull 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 Bungee Cord for Banner, Tarp, Pavilion, Tent, Curtains Extension Harness, Tarp Support, durable and friction resistance. It has great tension to fix the tarp firmly. Useful for multiple daily use, Very easy to use tensioner. The attached tent tensioners can be attached and removed in seconds without additional tools. No unnecessary cutting of cable ties ever mounted, The bungee cords can be reused at any time. Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.