A great choice for juniors wanting to learn proper swing mechanics and ball control, the Dunlop Stage 1 green mini tennis balls are designed for children aged 9-10. They are 25% slower than regular tennis balls to give youngsters more time to position themselves correctly on the court. The balls are ideal for kids who have progressed their way from stage 3 and stage 2 tennis balls and allow young players to focus on technique and stroke development. Approved by the ITF (International Tennis Federation), the balls can be used for coaching and training. They are supplied in a tube of 3.