This maximum expansion 9mm bullet offers unequivocal penetration. It is exceptionally accurate. The NAS3 two-piece case consists of a solid nickel-plated aircraft aluminum head and a proprietary enhanced nickel alloy stainless cylinder. The 9mm case is 50% lighter than conventional brass cases. The nickel plated aircraft-grade aluminum head, offers greater lubricity than brass and will not abrade, clog, foul, wear-out or damage breach and ejector mechanisms.