High Quality The base of the tennis trainer is made of high density materials that are very strong and durable. The tennis rebound ball is made of chemical wool fabric that has strong abrasion resistance and good elasticity. The attached elastic cord is thick enough and durable Use Tennis training device used for one-on-one tennis. A long elastic rope is attached to it, which can be stretched if necessary. When you hit the ball, the ball returns to the ball and you can hit the ball again hit to practice different punching techniques Water inlet and outlet Tennis training equipment is equipped with water inlet and outlet. Filling the training tool with water or sand and then creating a non-slip design on the floor can improve the stability of the Coach base to be improved. The spherical groove design is very suitable for the attached tennis ball Self-taught tennis training Rope rebound tennis is very useful for personal tennis training. It can improve your concentration, exercise ability, and hand-eye coordination. Simple and practical Portable set The tennis training device is very portable. Before filling with water and sand, the base of the tennis trainer is light and easy to carry. You can easily take the tennis trainer outside and start personal training. No need to catch the ball