Single Trainer - This is a great one-person tennis trainer with one tennis ball attached with a rope. High Quality and Durable - The tennis trainer is made of high-quality PE material, and the tennis ball is made of thickened rubber inner liner and elastic nylon rope, which provides effective rebound and durability. Clever Design - The top is a semi-circular groove design, allowing tennis balls to be stored when not in use. The middle part is designed as an annular groove, which can hold the elastic rope, avoiding entanglement and knotting, and making storage more convenient. Designed for Single Training - The tennis self-trainer is equipped with a high-quality elastic ball and elastic string. When you hit the ball, the tennis ball will rebound again through the elastic line, achieving the effect of repeated strikes. This allows you to train independently and meet your daily practice needs. Easy to Carry - The tennis training device features a hollow structure kettle design. After training, you can open the mouth of the bottle and pour out the water or sand inside. A handle is added to the side for more convenient and comfortable carrying. Wide Range of Use - The tennis practice rebounder is suitable for outdoor training, such as in parks, tennis courts, or back gardens. It will help you enjoy pleasant leisure time. Material: Plastic + rubber + nylon. The size of the base is approximately 23 x 23 x 5 cm, and it can be filled with water or sand. The diameter of the tennis ball is 6.5 cm, and the length of the nylon rope is 4 meters.