1、Made of high‑quality materials, durable, training tennis ball with string, very light and easy to carry. 2、Easy to use, tie the ball to the base with elastic cord on it, no need to pick up the ball. 3、Multifunctional tennis practice tool, self‑learning training rebound tool, can practice all your tennis skills. 4、For beginners and intermediate tennis players, the elastic rope tennis trainer is a good teaching tool. 5、It is not restricted by the venue, fit for tennis/basketball courts, driveways, garages, basements, fitness rooms or other open spaces. 1 x Tennis Ball with String Item Type: Tennis Ball with StringMaterial: Rubber+Fabirc+Elastic StringColor: As Picture ShownBall Diameter: Approx. 64mm/ 2.5inString Length: Approx.  3.8m/ 12.5ftWeight: Approx. 77.0g/ 2.7ozElastic Reference: about 130cm/ 51.2in ( 2.54m/ 8.3ft height free fall)