Gamma Orange Dot 60 Tennis Ball - 12 Pack For those that are trying to improve their tennis skills, the GAMMA 60 Orange Dot Tennis Balls are a great option for training and tennis tournaments as the 60 Orange Dot ball is USTA approved for 10 and Under tennis tournament play. These lightweight tennis balls feature a low compression core making them 50% slower than a standard tennis ball and providing a lower bounce. Numbered 1-3 for tournament play. USTA/ITF Stage 2 specification.