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BBCOR Bats. BBCOR (Batted Ball Coefficient Of Restitution) is the current standard that regulates how much trampoline effect the barrel of a bat has on a ball. The BBCOR standard's goal was to make non-wood bats perform more like wood bats to even the playing field and make the game safer by decreasing batted ball speed.
Little League, USSSA, and NSA use the Bat Performance Factor (or BPF) to regulate bat performance.The BPF involves the bat-ball coefficient of restitution or BBCOR. Its definition is similar to that used for the ball (Eq. 2.1). We take the ratio of the relative speed after impact to the relative speed before impact.