Single Trainer-This is a great one-person tennis trainer with 1/3 tennis balls with rope. Tips: Tennis balls are consumables. It is recommended to replace them with new ones after a period of use. High Quality and Durable-Tennis trainer is made of high-quality PE material, the tennis ball is made of thickened rubber inner liner and elastic nylon rope, which can achieve effective rebound and durable. Clever Design-The top is a semi-circular groove design, tennis balls can be placed when not in use. The middle part is designed as an annular groove, which can place the elastic thread, thereby avoiding the trouble of entanglement and knotting, and is more conducive to storage. Designed for Single Training-The tennis self trainer is equipped with high-quality elastic ball with 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. Easy to Carry-The tennis training device 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. Wide Range of Use-The tennis practice rebounder can be used for outdoor training, such as parks, tennis courts,back gardens. It will accompany you to spend a pleasant leisure time. Material: plastic + rubber + nylon, The size of the base is about: 23 * 23 * 5cm, which can be filled with water or sand. The diameter of the tennis ball is 6.5cm, and the length of the nylon rope is 4 meters.