The drop is the second most important thing in sizing a player with a new bat. First is the proper length. Once you determine that, the player should swing the heaviest bat she can get around quickly. That's not to say the heaviest bat, but the heaviest bat she can get good bat speed with. For most high school age girls with above average ability that's -10 or even -9. For high school players with average or below (less than a .300 batting average) as well as younger girls the drop should probably be about -11 or -12.
As stated before, the first thing to find out is the proper length. To do that click the Bat Sizing Guide link
http://www.aluminumbats.com/batsizingguide-thebattersbox.aspx
What is the drop?
Bat Length Minus The Drop = Bat Weight
"The Drop" is a common term for describing the weight of an aluminum bat. It is unique to aluminum and composite bats as the weight of a wood bat varies somewhat within each bat.
The drop simply means you take the length of the bat and subtract the drop to determine the weight.
For Example: The DeMarini CF4 is a -10 and is available in 31", 32", 33" and 34". Therefore, a 31" would weigh 21 ounces, a 32" would weigh 22 ounces and so on.
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The drop is the weight of the bat in relationship to the length. If you have a 32 inch bat and a -10 drop the weight is 22 ounces. If you have a 32 inch bat and a -9 drop the weight is 23 ounces.
drop means how many ounces it is lighter than the length of the bat for example a drop -10 on a 32" bat would be 22 ounces
It is the difference between the length of the bat and the weight, ie 33 in length and 23 oz weight, is a drop 10, or -10, 33 in length and 24 oz weight is a drop 9, or -9, etc.
There's 8 10 and 12 drop bats it all just depends on weight how old you are and such. I'm a freshman in highschool and About 119 pounds and the 10 drop is what I use
The drop is the difference between the length of the bat and the weight of the bat. If you have a 32 inch bat and its weight is 22oz you have a -10 drop.
It doesn't "affect" the bat. Drop is the difference of the length and the weight.