This Tecnifibre Stage 1 carton contains 144 green tennis balls, ideal for clubs, tennis schools, and intensive group training. Stage 1 (green) balls are slightly pressurised and roughly 25% slower than standard balls, making them ITF- and LTA-approved progression balls that help players develop technique before moving to full-speed balls. • Carton of 144 Stage 1 (green) tennis balls • Approximately 25% slower than standard balls • ITF-approved progression balls for the green stage • Ideal for clubs, schools, and high-volume training