This is solo tennies training kit for kids, No need for a partner or ball machine. When you hit the ball, the tennis ball will rebound again by the traction line to achieve the effect of repeated strikes. Get started to train your serve, forehand and backhand easily. Tennis trainer rebounder tools are very suitable for friends, family members or children who like to play tennis. The tennis practice rebounder can be used for outdoor training, such as parks, tennis courts, back gardens. Train everywhere and whenever you want. Fill the trainer base with water or sand, it becomes heavy enough to hold the unit in place, attach the return string to the ball, and start hitting the ball. it is easy to use and convenient for training without picking balls, work as nice accessories for your tennis training. This tennis trainer kit is designed as a hollow structure kettle. After practice, simply wrap the cord around the base and take it with you. At the same time, a handle is added to the side to make carrying more convenient and comfortable.