Combat 2014 B3AB Composite BBCOR Baseball Bat (-3) PMT (Percision Molded Technology) allows Combat engineers to design barrel wall thickness to maximize barrel trampoline effect & bat performance. BFT (Blended Fiber Technology) is used to create more trampoline effect without sacrificing durability. LST (Localized Stiffening Technology) to achieve the absolute maximum performance and durability at every point along the barrel.