This tennis trainer set includes trainer balls with string and a non-slip base, perfect for self training to improve personal tennis skills. Made of high-density PE plastic and a heavy base, the trainer is designed to stay in place. Easy to carry with a kettle structure and handle. Ideal for indoor and outdoor practice, such as playgrounds, gardens, tennis courts, etc. Great gift for tennis enthusiasts, families and children. Features 1. Tennis Practice Equipment: Our tennis self trainer is equipped with 1 tennis trainer balls with string and 1 strong PE material base. This tennis trainer set can improve your personal tennis skills if you want to play but don't have a partner or a tennis court. 2. Perfect Design: Our tennis ball practice trainer is made of high-density PE plastic and the bottom is made of non-slips material. Unscrew the cap of the tennis trainer, fill it with plenty of sand or water and let it become heavy enough, Heavy base and non-slips of bottom will hold the training base in place, which strengthen the a steady hold, make sure the base don't skid on the ground. 3. Easy To Carry: This tennis practice device is designed as kettle structure. After training, you can open the cap, pour out the water or sand, simply wrap the rubber string around the tennis trainer , which is very convenient to take home and store for future use. At the same time, there is a handle on the side, which makes carrying more convenient and comfortable. 4. Single Tennis Rebouner Training: No partner and tennis court required, just an open space and a tennis training set. the tennis ball hits out with the elastic sthring to re-bound automatically. It's easy to start training on your serve. 5. Perfect Tennis Practice Gift: A great gift for tennis enthusiasts, families and children who enjoy playing tennis. Significantly improves swing rhythm, footwork and technique. It is ideal for indoor and outdoor practice, such as playgrounds, gardens, parks, tennis courts, etc. Specification Material: PE Color: Blue Size: Base: 21 x 5 cm, Ball: 7 cm Weight: 190 g Package Include: 1 x Tennis Trainer Base 1 x Tennis Ball