Tennis Skill Enhancer - A great accessory for tennis training, can help hone tennis skills, but also can improve concentration, athletic ability, hand and eye coordination and develop interests Sport. Stable baseboard - The base has a valve to put sand or water in to add weight and provide stable support for training. Durable and portable - The base is made of high quality plastic, sturdy and durable, the bonus rubber cord is very elastic and portable. Exquisite design - the small ring on the side is used for hanging and the concave part for placing the tennis ball. Easy to use - convenient for training without taking a ball, lightweight and portable, suitable for many places like garden, park, etc. Product Descriptions Tennis Ball Trainer - Great gift for your friends, family members and kids who love to play tennis, and it can help improve your running action, footwork and running precision control, tennis skills, suitable for many places like garden, park, etc. Specification: Material: Plastic+Rubber Color blue Base size: about 15*20*5cm/5.9*7.87*1.96in Ball Seat (Slide) Size: Approx. 6.3cm/2.48inch Ball elastic force: about 1.2m/3.39ft Elastic adhesion: 4 - 8 m / 13.12 - 26.24 ft Weight approx. 270g Package List: 1 * Tennis Training Base 1*ball with rope