Information and dimensions: ball diameter approx. 2.5 cm, loop measures 12.5 cm, length approx. 15 cm, extendable to approx. 15 cm. Up to 30 cm, elastic thickness approx. 4 millimeters. tensioner, set of rubber bands tensioner kit: Your set includes 50 tensioners. Bungee jumpers are made of soft elastics with a plastic ball at the bottom. HIGH TENSION: With these elastic bands stretchable objects such as tents, flags or tarps can be firmly fixed thanks to the excellent tension. EASY TO USE: Each tensioner has a plastic ball. Thread the bottom end of the elastic through the eyelet and around the plastic ball. The binding will stay in place thanks to the tension applied. Versatile use: These tensioners offer many possibilities of use: They are particularly suitable for fastening tents, gazebos and all kinds of tarpaulins as well as covers for swimming pools and ponds. They can also be used to attach flags. Elastic hook with plastic ball With the elastic loops, the uses are multiple. They can be used to secure tarps, tents or other types of coverings to various eyelets while providing maximum tension. The bungee cord can also be used to secure pool covers, nets or tents. They are also ideal for banner ads. The tensioner is easy to install and remove. These tensioners are very easy to use. The elastic goes through the eyelet then attaches to the plastic ball. The tension kept him from detaching himself. To remove the tensioner, proceed in the same way as when removing it.