MBL Bat Rules

* For 9-14U age levels, players must use bats with barrels and length-weight differentials that adhere to the bat rule table below, AND that have one of the following stamps:
- USA Baseball
- USSSA
- BBCOR

* 15AA and 15AAA must use a -3 BBCOR stamped bat, or a single-piece wood bat.

* Bats that are part wood and part composite material are not single-piece wood bats and, therefore, must have a BBCOR/ USA Baseball/ USSSA stamp.

* Any bat with a USA or USSSA stamp that has been deemed illegal via publication by the manufacturer or governing body (i.e., USSSA) based on subsequent testing is also illegal in MBL league play.

9-11U

Barrell: 2 ¾” or less  /   Weight differential: Unlimited

12U & 13U

Barrell: 2 1/4" or less with UNLIMITED weight differential or

Barrell: 2 ¾” or less  /   Weight differential: -10 or less

14U & 14/15A

Barrell: 2 ¾” or less  /   Weight differential: -5 or less

15AA and 15AAA

BBCOR stamp with -3 differential.