XIANQI Tennis Training Ball With String Tennis Trainer Balls Self Practice Trainer Tool Tennis Ball Training Equipment For Tennis Trainer Tie the ball to the base by rubber band, no need to pick up the balls frequently Training tennis with string, very lightweight, easy to carry The trainer is a great teaching tool for beginners and intermediate tennis players. Multipurpose trainer for practicing all your tennis skills The rubber band is about 4 meters long. The rubber band can be tied to heavy objects or directly to the triangle area of the beat. It can be used for training by yourself. It is convenient and simple, and you can start training. Color: yellow Size: about 63mm Delivery Quantity: 4 Pieces