Engineered for competitive 10-and-under play, the US Open Green Tournament Ball is ideal for developing juniors who prefer a slower ball with less bounce. Easier to hit than a regular tennis ball, this green tournament ball maximizes capacity for growth and improvement on a variety of tennis strokes. Recommended for juniors and beginner adults using rackets between 25" and 27" in length. Can includes 3 balls and case includes 24 cans.