Description It is a set of tennis ball training tool, light and durable for us to use. The trainer base can be used to train tennis with strings. Pull out the plug of the base, fill the hollow with water or sand to keep the base stay on the ground steadily. Save you from the bother of the limitation of site, play or practice any place as you like. Features - Color: Blue.- Material: Rubber.- Size: 23 x 15 x 5.2 cm.- Anti hole molding design, can fill in the heavy objects to train.- Semicircular ball groove structure, make the ball easily to be attached.- It is easy to use and convenient for training without picking ball, lightweight and portable, suitable for many places like garden, park, etc.- The tennis ball trainer is great accessory for tennis training, can help to perfect skills of tennis.- Portable handle design, giving you a comfortable using experience.Packing list: 1 x Set of Tennis Ball Training Tool