How BESR Bats Were Made

BESR certified bats were built with a composite lining that would give the bat more "pop" once the bat had been broken in. The composite lining, as pictured below, consists of layers of carbon fiber and strong glue.

Over time the glue or resin loosens up and allows the barrel of the bat to be more flexible resulting in more "pop." This added pop from the carbon fiber is one of the reasons that the certification changed, due to a large number of cases where the opposing pitcher would be injured from a hard hit ball from one of these bats.