This Pure2Improve tennis trainer is an ideal practice partner to improve your game, maximize your speed and endurance and improve all your strokes. Thanks to the sturdy non-slip base and tangle-free bungee cord, you can practice for hours without a partner to get your body and skills in shape. The 4.6m bungee cord extends up to 15m. There are also 2 balls included in the delivery. Pure2Improve products help athletes of all levels to improve their performance. Whether you like football, skating, hockey or swimming. Being in top physical condition will improve your athletic performance and protect you from injuries. Every sport places different physical demands on the body. You may need training to improve your balance, flexibility, or agility so you can reach your full potential.