The drop is just the difference between the length of the bat and the weight of the bat. Ex: 33", 23oz bat = -10 (drop 10); 33", 24oz = -9 (drop 9) etc. All-in-all it just depends on how tall a person is and how much weight she can handle when swinging. A -9 would be heavier than a -10, but a -9 33" bat weighs as much as a -10 34" bat. So, if a bat is too heavy or too light it can negatively effect the hitter's swing.
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