The Cutting Edge MTH line is machined out of lead free solid copper bar stock on a CNC lathe. These are a high BC, expanding bullet designed for hunting at all ranges. A unique feature of this bullet is Cutting Edge's patented SealTite(TM) band which is a band slightly larger than caliber diameter around the bullet which was designed to eliminate fliers by preventing gas blow-by. The SealTite(TM) band also decreases copper fouling which is typically associated with mono metal bullets. Mfg: Cutting Edge Bullets