Tarp Tensioners: The ball tensioners include 50 pieces, the cable size is 300 x 3.5mm. These reliable rubber straps provide a secure hold for your tarpaulins and banners. High quality rubber and plastic balls. It is durable and resistant to friction. It has a lot of tensile force and can hold the tarpaulin firmly. The tarpaulin tensioner is suitable for tents, posters, exhibition halls, trampolines, mesh banners and PVC banners. It has great tensile force and can firmly fix the tarpaulin. This ball tensioner is easier to use than other tensioners, just thread the rubber cable through the hole and pull it place on the ball. This cable has the best elasticity. Don't worry about your stuff being so bulky that the cables break. The rubber ball tensioner installs and removes in seconds. The plastic and rubber are very weather resistant, and the length of the rubber can be adjusted by moving the knot. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be color differences, please refer to the actual item received.