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Softball Bat size for 9-year-old girl?

What does -9 mean on a softball bat?

-9 means the difference between the weight and the length of the bat (the length of the bat minus the weight of the bat). Most bats on average are -10

What size bat for fastpitch softball?

Your bat should, if you put the end of the barrel on the ground next to you, come up right to where your hip is. That gives you perfect length to cover the plate for inside pi