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. |