Specifications: Material: Plastic Rope length: about 4M Features: 1. Non-slip bottom. You can train anytime and anywhere when you want. 2. Balls that are resistant to friction.Facilitate repeated practice many times. 3. Anti-winding rubber band. Steps: 1. Fill the base with water or sand. 2. Tied the tennis ball with string to the base. 3. Slightly hit the ball upward to prevent the ball from being pulled back to the ground by the rope. Solo Tennis Training:The personal tennis practice equipment can training any place at any time, builds quickness, hand-eye coordination, and stamina. It will improve your concentration, athletic ability and develop interests of sports. The tennis trainer is easy to use and can be trained without picking the ball, and this tennis training tool is lightweight and portable, which is helpful for tennis single person practice. 2020 Upgrade Design:The tennis self trainer rebound has a valve on the base, which can putting sand or water into it to increase the weight and the small ring on the side for hanging band, the concave part for placing tennis ball, convenient and practical to use. High Stretch String: The portable tennis training rubber rope has high elasticity and wear resistance, which can shorten the rebound force, wrap some of the cord around the base to your desired length or you can stretch it for heavy hit balls. Easy To Use: The tennis trainer tool set is easy to use and convenient for training without picking ball, no need for a ball machine or a wall. And the trainer base is very light when empty for easy carrying, it have a semi-circular ball groove for storing tennis balls after use. Perfect Gift:The best gift for your family members, friends,children who like to play tennis, this tennis rebound equipment can improve player stroke action, footwork and hitting. Suitable for many places like garden, park, yard etc.