High Quality Ball Tensioners - Our ball tensioners are made from high quality nylon, rubber and plastic balls. It is durable and abrasion resistant. There is a lot of tension to secure the tarp securely. Its service life is more than 2 years. Dimensions of the ball tensioner - The length of the cable is 15 cm. The extreme extension length is nearly 25cm, which can hold the tarp more tightly. HOW TO USE - This bale stretcher is easier to use than other bale stretcher, just pass the rubber cable through the hole and place it on the ball. This cable has the best strong elasticity. Don't worry about your stuff being so big that the cable will break. MULTIFUNCTIONAL - Our ball turnbuckles contain 20 pieces. Other sellers only give you 10pcs. The tarp stretcher is suitable for tents, tarps, posters, stretchers, expansion rings, tarpaulin supports, rubber tarps, rubber stretchers, tents, rubber, curtains, etc. This is a great device for camping or storage black，16 pcs