-Tennis Trainer: Being tired of picking up the ball when training? Taking this special ball with elastic string to solve it. Easy to use and convenient for training without picking ball, and it is helpful for single person practice and beginners.Training Tennis Ball: with 3.8m(12.5ft) elastic string, It is long enough and will not impede you when you training.2 ways of usage: with or without the string, you can play with it easily. It is a good tennis training accessory to practice many tennis skills.Material: outside: felt. Inside: rubber. lightweight and portable, the training ball is suitable for indoor and outdoor. it is very helpful to reduce fat, relieve stress, and improve the coordination of hands and feet.Size: Ball diameter 6.5-6.8cm(2.56-2.68in), string length 3.8m(12.47ft)ProduktbeschreibungColor: YellowSize: Ball diameter 6.5-6.8cm(2.56-2.68in), string length 3.8m(12.47ft)Type:Package Includes: 2 x Tennis ball with stringNote:- Please refer to the measurement. Tiny measuring error is allowable in normal range.- There might be a little color difference due to the monitor, camera or other factors, please refer to the physical item.