Minors & Majors 2017 BPF 1.15 marking/ 2 ¼" barrel maximum 2018 USA Baseball marking 2 5/8" barrel maximum Intermediate (50/70) & Junior 2017 1) 2 ¼" alloy/metal barrel with BPF stamp of 1.15 2) 2 5/8" alloy/metal barrel (no marking required) 3) 2 5/8" composite barrel with BBCOR stamp 2018 USA Baseball marking 2 5/8" barrel maximum NO BBCOR ALLOWED Senior 2017 ALL bats must be BBCOR 2018 ALL bats must be BBCOR