Combat B3SL Senior League Baseball Bat -10 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. ACT (Anisotropic Composite Technology) varies stiffness along the handle reducing sting and across the barrel for softer feel and improved bat performance.