Low compression tennis ball For ages 9-10 Balls are 50% slower than normal tennis balls Designed for stage 2 - orange, 60' courts USTA approved Low compression tennis ball ideal for ages 9-10. Stage 2 ball ideal for use on 60 ft courts and driveways. USTA and ITF approved.,Low compression tennis ball For ages 9-10 Balls are 50% slower than normal tennis balls Designed