Weight, and marketing claims. The official bat, according to ASA, may not exceed 34" in length, nor 38 ounces in weight. Generally, "fastpitch" bats are -11 to maybe -7, meaning the 34" versions weigh 23 to 27 ounces. Bats heavier than that are marketed as slow pitch bats, whose players have all the time in the world to get that tree turned around.
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