Low compression tennis ball ideal for 11 years old and up. Used Often used with 25"" - 27"" rackets. Description Designed 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. Playing Surface Designed for stage 1, 78' court Designed to aid a transitioning junior or beginning adult Bounce This ball bounces 25% lower than regular tennis balls. Low compression tennis ball ideal for 11 years old and up.