Description: 【Tennis Trainer Aid】: Floor tennis swing trainer, very convenient tennis hit training tool. A portable tennis trainer for topspin, stereotype, practice training, suitable for many places both indoors and outdoors, such as home, gym, garden, park, etc. 【Tennis Training Tool】: This professional tennis training machine will improve your response ability, predictability and hand eye coordination. Stable, fast, self study tennis. 【Tennis Swing Stability】: The swing trajectory of this tennis trainer is very stable, swinging back and forth, suitable for kids, adults, old men, beginners and training fixed movements. 【Quality】: This tennis trainer rebound ball is made of quality steel spring, rod and PP base material, sturdy and . Adjustable height make the swing training gear very convenient to use. 【Easy to Use】: The tennis ball trainer partner sparring device is convenient for training without the hassle of picking up the ball. Great tennis training equipment for practicing your tennis skills on your own. Size Chart: Height: Adjustable(the highest is about 105cm/41.34inch) Base: 40cm/15.75inch Package Includes: 1 Tennis Trainer Note: Fill the base with water before installing and using it