The high quality: 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. Tarp tensioner is suitable for tents, posters, pavilions, trampolines, mesh , PVC banners, It has great tension to fix the tarpaulin properly. Reusable: rubber ball tensioner can attached and removed in seconds. Plastic and rubber have good 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/11.8inch. The way to use This ball stretcher is easier to use 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 that your thing is so big that the cable will break. Product Elastic bungee cord for banner, tarp, gazebo, tent, curtain extension harness, console cloth, durability and friction resistance. It has a great tension to fix the tarp properly. Useful for daily use, very easy to use tensioner. Attached tent tensioner can be attached and removed in seconds without extra tools. No unnecessary cutting of already assembled cable ties, Tensioner can be reused at any time. Specification: 30 pieces Set length: 30 pieces 150mm rubber tensioner Material: Ball tensioner is made of white nylon, rubber and high quality plastic ball.