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 tarp. Tarp tensioner is suitable for tents, posters, pavilions, trampolines, mesh banners, PVC banners, It has great tension to firmly fix the tarp. 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 extreme expansion length is almost 300mm/11.8 inch. 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 Bungee Bungee Cord for Banner, Tarp, Pavilion, Tent, Curtains Extension Harness, Tarp Support, Durable and Abrasion Resistance . It has great tension to secure the tarp firmly. Useful for multiple daily use,Very easy to use tensioner. Attached tent tensioners can be attached and removed in seconds without additional tools. No unnecessary cutting of cable ties already fitted, The tensioners can be reused at any time. Specification: 30 pieces Length Set: 30 Pieces 150mm rubber tensioner Material: Ball Tensioner is made of white Nylon, rubber and the high quality plastic ball.