REP BAT RULES (P2-5)
The maximum legal diameter for bats shall be 2 3/4".
Subject to the following, in addition to wooden bats, metal bats shall be allowed in Rep play.
For all Minor Peewee and Peewee play, metal bats with a length to weight difference of -10 or less are permitted.
For all levels of play Minor Bantam and above, only wood bats, bamboo bats and wood composite bats will be allowed. Wood composite bats include wood bats with fibreglass sheathing and wood barrelled bats with composite handles. Wood composite bats do not include any bat that has any metallic component.
SELECT DIVISION BAT RULES (SP 7.4)
Midget & Junior levels will use Wood or Wood composite bats with a maximum minus 3. The minus 5 bat restriction applies for Bantam level only.
Where metal bats are permitted, Baseball Ontario allows the use of BESR certified bats and BBCOR certified bats in Baseball Ontario play, and to accept the NCAA's list of BBCOR certified bats and the NFHS’s list of BESR certified bats, with the understanding the lists may be modified from time to time. Solid wood bats are always approved for Baseball Ontario play. For the purposes of the OBA Bat Rule, bamboo bats are wood bats; and composite wood bats are wood bats. Metal/wood bats are not considered wood bats and cannot be used at Minor Bantam and above. Hollow aluminum alloy bats (Class A in the lists) are only allowed for Baseball Ontario
play at Major Peewee and below.