Features: Designed with non-slip EVA on the bottom of the tennis trainer and anti-wrap binding line. The tennis rebound ball is made of wool fabric with chemical fibre needles and has a high abrasion resistance. It can jump up to 135 cm wide. The black rope has a long length of 4 metres, is thicker and more durable. Super easy to use, simply fill the tennis pad with water or sand and tie the tennis ball to the mat. The special inlet and outlet design solves the problem of difficulties when filling and pouring water. Suitable for all ages such as children, students, teenagers, office workers, middle-aged communities and the elderly. You are not bound to the venue. You can use this tennis trainer anytime and anywhere. Steps: 1. Fill the tennis base with water or sand. 2. Tie the tennis ball to the base. 3. Gently hit the ball up to prevent the ball from being pulled back to the ground by the rope. Specifications: Material: plastic + rubber. Colour: blue and green. String length: 4 m. Contents: 1 x Trainer Base 2 x Training Balls Note: 1. Due to manual measurement, the product size may have some errors. 2. Due to the light, the actual colour of the product may differ slightly from the display table, please forgive me. 3. If you encounter a quality problem after receiving the product, please contact us in time.