From kids learning to master the game to experienced players practicing advanced skills, the GAMMA 78 Green Dot Tennis Balls are a great option for improving tennis techniques. The 78 Green Dot ball is USTA approved for 10 and under tennis tournament play and also ideal for Ages 11+ and adult beginners on a 78' court. These lightweight tennis balls feature a low compression core making them 25% slower than a standard tennis ball and providing a lower bounce. Players are able to get into position and react to hit the ball more effectively. Numbered 1-3 for tournament play. USTA/ITF Stage 1 specification. BENEFITS & FEATURES: 25% Slower: Featuring a low-compression core, these tennis balls fly 25% slower and have a lower bounce than standard tennis balls, making it easier for players to get into position to hit better shots during practices and games Training Tennis Balls: Instructors can use these balls to build tennis skills with children as well as adult beginners. These low bounce tennis balls are great for use in drills to improve technique and control with volleys, serves and ground strokes HI-VIS Yellow Felt: Yellow felt surface and large green dot make these tournament/practice balls highly visible and easy to identify from standard tennis balls Made for 78' Courts: Designed for players transitioning from 60' to 78' courts, these training tennis balls are great for practicing full court play as well as being used for competitive tournaments for young players USTA/ITF Stage 1 Specifications: These tennis balls have been tested and meet all Stage 1 specifications outlined by USTA and ITF for use in 10 and Under tennis tournaments