No need for a dedicated tennis ball, this indoor tennis self-training kit just needs a door and you alone It's a very convenient tennis kit. Easy to set up: first clip the door's clip and turn the length of the rope. This tennis trainer is very easy to install and requires a door. Exercise Your Reflexes: The tennis training set will improve your reflexes, eye coordination. Yes, it is also possible for two or even more people to come. Suitable for children, youth, middle age and . Eco-friendly Material: This indoor hanging tennis trainer is the best material, you can use it with confidence. Your tennis balls are everywhere. PERFECT GIFT: This one provides endless fun. The perfect gift for a child that is sure to love Size: ball line 135cm Weight: racket 60g Material: ABS Color: yellow pink green Quantity: 1 set include: 1 set of hanging tennis balls notes: Please allow slight errors due to manual measurement and monitor.