Designed to aid juniors looking to get started or develop their game, the Red Starter Ball features a lower compression for significantly slower, more playable bounce characteristics. This ball bounces 75% 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. This ball is best used on 36 foot courts, driveways, or back yards with a racket between 19 and 23 inches long.