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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).
Both sports use bats, but a softball bat and a baseball bat are two completely different pieces of equipment. Neither softball nor baseball bats generally exceed 34 inches in length (baseball bats have a maximum length of 42 inches, though this is a rarity), but their weight differences are vastly different. In both sports, the difference between the length and weight is referred to as to the drop.