The GAMMA Revolution Foam Training Balls cater to players aged 8 and under on a 36' court. These training balls boast a 75% reduction in speed compared to standard tennis balls, ensuring a slower pace that aligns with the developmental needs of young players. The soft foam composition not only facilitates a gentler impact but also enhances safety during the learning process. These training balls double as an excellent warm-up tool for adult players. USTA/ITF Stage 3 specifications.