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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).
Slow pitch Softball Bats are most commonly made 34 inches in length, are made from carbon fiber composite materials, each softball bat weighing between 26 and 30 ounces, with softball bat diameters of 2.25 inches to 2.75 inches.