DESIGNED FOR SINGLE TRAINING: The tennis self trainer is equipped with high-quality elastic ball with 13 ft elastic string. When you hit the ball, the tennis ball will rebound again by the traction line to achieve the effect of repeated strikes. So you don't need a training object to meet your daily training needs. Portable tennis cricket tool DESIGNED FOR SINGLE TRAINING: The tennis self trainer is equipped with high-quality elastic ball with 13 ft elastic string. When you hit the ball, the tennis ball will rebound again by the traction line to achieve the effect of repeated strikes. So you don't need a training object to meet your daily training needs. Portable tennis cricket tool EASY TO CARRY: Portable cricket and tennis tool is designed as a hollow structure kettle. After training, you can open the mouth of the bottle and pour out the water or sand inside. At the same time, a handle is added to the side to make carrying more convenient and comfortable. Self tennis practice ball with string