High Quality Bouncing Ball Our bouncing ball is made of high quality nylon, rubber and plastic balls. It is durable and abrasion resistant. It has plenty of traction and holds the tarp securely.Its service life is more than 2 years. How to use This ball stretcher is easier to use than other ball stretchers, just pass the rubber cable through the hole and place it on the ball. This cable has the best strong elasticity. Don"t worry if your stuff gets too big and breaks the cables. Versatile Our ball stretcher contains 40 pieces. The tarp stretcher is suitable for tents, tarps, posters, stretchers, expansion rings, tarpaulin supports, rubber tarps, rubber stretchers, tents, rubber, curtains, etc. Great equipment for camping or storage. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there are will have some color difference, depending on the physical object received Delivery Quantity: (according to the main image)