The Tennis Trainer is a great teaching tool for beginners, allowing the user to hit the ball in any direction as the tethered ball will always return! The included tennis ball can also be untethered from the base and used as a regular ball. The base must be filled with water before use. Suitable for outdoor use only Includes: 1 x Tennis Ball, 1 x Elasticated String, 1 x Base Recommended for children aged 5 years