Improving Tennis Skills - A great accessory for tennis training, can help perfect tennis skills, but can also improve concentration, athletic ability, hand and eye coordination, and develop the interests of the sport. Stable Baseboard - The base has a valve to put sand or water in to add weight to provide stable support for training. Durable and Portable - The base is made of high-quality plastic, robust and durable, the bonus rubber rope is highly elastic and portable. Fine design - the small ring on the side is used to hang up and the concave part to place the tennis ball. Easy to use - practical for training without taking the ball, light and portable, suitable for many places such as garden, park, etc Product descriptions Tennis Ball Trainer - Great gift for your friends, family members and children who love to play tennis, and it can help improve your hit action, footwork and hit precision control, skills of tennis, suitable for many places like garden, park, etc. Specification: Material: plastic + rubber Color blue Base size: about 15 * 20 * 5cm / 5.9 * 7.87 * 1.96 inch Ball seat size (Dia): Approx. 6.3 cm / 2.48 inches Elastic force of the ball: approximately 1.2 m / 3.39 feet Elastic binding force: 4 - 8 m / 13.12 - 26.24 ft Weight approx. 270 g Package list: 1 * tennis trainer base 1 * ball with rope