Makes for stable baseboard Makes for stable baseboard when adding water and sand. The tennis ball training base provides stable support for training through the ground has a valve for attracting sand and water in it to increase the weight, and the small ring for hanging on the side tape, the concave part for placing tennis ball, light and practical in use. Great tennis self-training tool Easy to use and great for training without plucking ball, and helpful for single person practice. Also, it could improve your concentration, athletic skills, and hand and eye coordination, and develop interests in the sport. Ideal Gift This tennis trainer is the ideal partner to improve your overall game. Get hours of continuous practice without a partner to get your game and your body in shape. Great gift for your friends, family members, and children who love playing tennis. Premium Material The base is made of high quality plastic, sturdy and durable, the additional rubber rope is very elastic and portable with exquisite design and high quality workmanship. A perfect teaching tool for beginners and advanced players. Product descriptions This practice tennis trainer is the ideal partner for improving your overall game. You can get hours of continuous partnerless practice to keep your game and body in shape. Great gift for friends, family and children who love tennis, the stable support for training, as it has a valve on the bottom for storing sand and water to increase the weight, and the small ring on the side for hanging tape, concave Part for placing the tennis ball, easy and practical to use. Specifications: Material: plastic and rubber Color: Blue Dimensions of the base: approx. 15 * 20 * 5 cm / 15 x 20 x 5 cm Ball size (diameter): approx. 6.3 cm / 6.3 cm Elastic force of the ball: approx. 1.2 m / 3.39 FT Strength of the elastic bandage: 48 m / 13.1226.24 FT Weight: approx. 270 g Scope of delivery: 1 x tennis trainer Base 1 x ball with rope Note: 1. Please allow 0-1mm errors due to manual measurement. Thank you for your understanding. 2. Not all monitors are calibrated the same, shows Note: The color of the items in the photos may differ slightly from the actual object. Please note the real one as standard.