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As of 2008 the circumference of a regulation size baseball is between nine and nine and a quarter inches which converts to between about 7.3 cm and 7.5 cm in diameter according to the official rules of Major League Baseball (MLB).
Softball Size The size of the ball varies according to the classification of play; the permitted circumferences in international play are 12 (30.5 cm) and 11 (27.9 cm). In fast Pitch 12 is standard but in slow pitch 11 or 12 can be used.