The Wilson US Open Red Tournament Transition Tennis Ball Case (72 Balls) are engineered for competitive 10-and-under play, the US Open Red Tournament Ball is ideal for developing juniors who prefer a slower ball with less bounce. Easier to hit than a regular tennis ball, this red tournament ball maximizes capacity for growth and improvement on a variety of tennis strokes. Features: Significantly slower and easier to hit than regular tennis balls (75% less bounce) Perfect for 10-and-under competitive play on 36’ courts Often used with 19’ - 23’ junior rackets Includes 3 balls per can; 24 cans per caseThe Wilson US Open Red Tournament Transition Tennis Ball is recommended for juniors using rackets between 19’ and 23’ in length.