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 firmly fix the tarpaulin. Reusable: Rubber ball tensioner can be attached and removed within seconds. Plastic and rubber have high weather resistance. Adjust the length of the rubber by moving the knot. 30pcs the cable length is 150mm/5.9inch. The extreme expansion length is almost 300 mm/11.8 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 breaks. Product Description Elastic Bungee Cord for banner, tarp, pavilion, tent, curtains Extension harness, tarp support, durable and friction resistance. It has great tension to firmly fix the tarpaulin. Useful for multiple daily use, Very easy to use tensioner. Tent Tie Downs can be attached and removed in seconds without additional tools. No unnecessary cutting of already mounted cable ties, tensioners can be reused at any time. Specification: 30 pieces Set Length: 30 Pieces 150mm rubber tensioner Material: Ball tensioner is made of high quality white Nylon, rubber and plastic ball.