-Ball tensioner contains 75 pieces, cable length is 150mm/5.9 inch. The extreme expansion length is almost 300mm/11.8 inch. -These reliable rubber harnesses provide a secure hold to your tarps and banners. rubber and high quality plastic ball. It is durable and abrasion resistant. It has a large tension to firmly fix the tarpaulin. -Tarpaulin tensioner is suitable for tents, posters, pavilions, trampolines, mesh banners, PVC banners, It has a large tension to fix the tarpaulin firmly. -It is easier to use this ball tensioner 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 about your thing being so big that the cable will break. -Rubber ball tensioner can be fixed and removed within a few seconds. Plastic and rubber have a high resistance to weathering. Aj...