There has been a recent change to the rules concerning bats.
Effective January 1, 2018, with the exception of -3 (BBCOR certified), all other minus factor bats (-5, -7, -9, etc.), must be YBBCOR certified (USA Bat licensing mark stamped on the bat). The 2017 season will be played under the same bat rules as 2016. To find out more about the USABat standard click here.