Wilson STARTER PLAY GREEN 4 BALL 18x4 ballsDesigned to aid a transitioning junior or beginning adult, the Green Starter Ball features a lower compression for slightly slower, more playable bounce characteristics. This ball bounces 25% lower than regular tennis balls, which gives players a greater opportunity to hone their strokes and focus on form as they continue to evolve their game. Perfect for practice on full size courts Often used with 25 27" rackets Includes 4 balls per can; case