BBCOR. 50 Certified For High School and Collegiate Play. One-Piece, All-Alloy Baseball Bat. A wonderful looking bat from a player in Pennsylvania. It has barely been used. NEW Liquid-Gel Dampening Knob - Patent Pending Technology That Holds A Precise Amount Of Liquid-Gel In The Knob to Absorb Vibrations, Creating A Smooth And Solid Feel.