Solo Tennis Trainer Device. Base with no Need to Fill with Water or Sand. Tennis Practice Equipment for Tennis, Paddle and Pickelball. With this kit you Can Practice your Swing Anywhere. You Can Do it on the Court, in the Park and in your Own Yard. Without Having to Rent a Place and Spend Money. You Can Do it at Any Time of the Year Regardless of the Weather. Excellent Choice for Kids and Begineers – This Tennis Equipment Training Promotes Motor Skills and Improves General Coordination and Hand-Eye Coordination. . Improves Balance. Boosts Strength and Endurance. Increase Speed and Agility. Develops Discipline and Game Learning. Have a Realist Experience!!!!!