Combat Spiked Slowpitch Softball Bat 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. NTI (Nanocomp Technology Inside) reinforces fibers and resin, which results in a dramatic increase in bat strength and durability.