The GAMMA Quick Kids 60 Tennis Balls are made for younger players and beginners transitioning from playing half court tennis but still not ready for a full size court. These lightweight tennis balls are 50% slower than standard tennis balls, making it easier for players to get in position and be ready to react to shots for more control and accuracy. They're also a great tennis aid for more advanced players wanting to learn or practice spin on a smaller court or against a backboard. USTA/ITF Stage 2 specification. BENEFITS & FEATURES: 50% Slower Speed: Made with a low-compression core and lightweight outer layer, these tennis balls fly 50% slower than standard tennis balls, making it easier for beginners to practice rallies and experienced players to practice more advanced techniques Training Tennis Balls: Designed for younger players learning the game, these beginner tennis balls are a great choice when instructing children on the fundamentals of tennis Two-toned Surface: Designed with a bright yelllow and orange felt surface, these tennis balls offer added visibility and are easy to identify from standard tennis balls. They also help players practice hitting and returning topspin and slice shots Made For 60' Courts: Designed for players transition from 36' to 60' courts, the slower and lower bounce makes these practice tennis balls suitable for instruction for beginners and youth tournaments USTA/ITF Stage 2 Specifications: These low bounce tennis balls are rated as Stage 2 balls by USTA/ITF for use in tournaments for youth 10 and under