The -10 is the 'drop', or 'drop weight', of the bat. The drop is the length of the bat, in inches, subtracted from the weight of the bat in ounces. A -10 bat is a bat whose length, in inches, is 10 more than the weight in ounces. An example of a -10 bat is one whose length is 32 inches and whose weight is 22 ounces.
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