Tennis Self Trainer Tennis Self Trainer Machine Imported Tennis Self Trainer Multi-Purpose Tennis Ball Practice Trainer: Tennis Self Trainer to practice all your tennis skills, perfect for indoor and outdoor tennis ball practice trainer. No need for a ball machine or wall Easy to use: simply hit the ball and the soccer ball returns to you! When you hit it faster, the ball is rebounded to you Tennis Trainer Ball with String: To shorten the rebound, wrap some rope around the base to the desired length. Or you can extend it for tough balls Material: Durable, rugged PE plastic, non-slip rubber base, Size: about 9.6 x 8 x 2.75''. Our tennis trainer rebounder can fill the base with heavy sand or water to instantly become heavy enough to hold the unit in place. Capacity: 1.2L Service: Each tennis trainer is set up with a 30-day return policy and ready to respond within 24 hours. Any problem we will try our best to solve it for you. Inkach brand is US registered trademark you can buy with confidence. Just "Add to Cart" and "Buy Now". Thank you