[Unique and practical design] Upgraded version of tennis trainer rebound ball, brand new imported black thick rubber band, more durable, length 3.9M, convenient for training, no need to pick up the ball often, just give you back and forth after a hit, for single practice It is really helpful and very suitable for beginners.[High Quality] The base of the tennis trainer is made of high-density materials, which is very strong and durable. The tennis rebound ball is made of chemical fiber woolen fabric, which has strong abrasion resistance and good elasticity. The attached rubber cord is thick enough and durable. This tennis training set is of high quality and practical.[Slip-resistant design] The bottom of this tennis trainer adopts a non-slip design, which increases the stability by increasing the friction with the ground. A port designed for easy filling and draining of water, filling the base with water or sand can hold the device in place. The spherical groove design perfectly fits the attached tennis ball. You can train anytime, anywhere.[Anti-twist design] The tennis trainer has a special device to connect the anti-wrap hook to match the use of the anti-wrap hook. The anti-entanglement design adopted at the tie line allows you to play without worrying about the trouble of entanglement with the elastic cord. The grip design on the side of the training device is convenient for carrying the tennis training device.