B007N0LMKW Gamma Quick Kids (Transition) Practice Tennis Balls: Red 36, Orange 60, or Green 78 Dot (25%-50% Slower Ball Speed) – 12, 36, 48, 60 Pack Sizes

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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 for use when instructing children or adult beginners on the fundamentals of tennis.
TWO-TONED SURFACE: Designed with a bright yellow 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 transitioning from 36′ to 60′ courts, the slower and lower bounce makes these practice tennis balls suitable for instruction for beginners or youth tournaments.

MEET USTA/ITF STAGE 2 SPECIFICATIONS: These low bounce tennis balls are rated as Stage 2 balls by the USTA/ITF for use in tournaments for youth 10 and under.