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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).
These bats are used by players who play in youth leagues that allow bats with barrels larger than 2 1/4 inches in diameter. Youth big barrel baseball bats can have a barrel diameter of either 2 5/8 inches or 2 3/4 inches, and generally have a length to weight ratio between -5 and -10 (with some -12s being available).