Tarp Tensioners: The ball tensioner contains 50 pieces, the cord length is 150 mm / 5.9 inches. The extreme stretch length is almost 300 mm / 11.8 inches. These reliable rubber loops provide a secure hold for your tarps and banners. High-quality rubber and plastic ball. It is durable and abrasion-resistant. It features high tension to firmly secure the tarp. The tent tensioner is suitable for tents, posters, gazebos, trampolines, mesh banners, and PVC banners. It features high tension to firmly secure the tarp. This ball tensioner is easier to use than others: simply pull the rubber cord through the hole and place it on the ball. This cord has the best elasticity. Don't worry if your device is so large that the cord might break. The rubber ball tensioner can be attached and removed in seconds. The plastic and rubber are highly weather-resistant. Adjust the length of the elastic by moving the knot.