SinterFire Special Duty Ammunition brings to bear the devastating effects of frangible when couple with a hollow point. Protect you home with a reduced chance of over-penetrating walls while still having exceptional performance. All SinterFire lead-free, frangible projectiles are manufactured using an exclusive blend of copper and tin composite material and a proprietary heat treatment process. SinterFire is the originator and innovator of this technology used by government, military and law enforcement personnel since 1998.Unlike conventional lead projectiles, which ricochet or fragment into large pieces, SinterFire projectiles disintegrate into small particles upon impact with surfaces harder than themselves. Since the projectiles are lead-free and frangible, they are ideal for close quarter training on steel plates and in tactical houses. This ammunition is new production, non-corrosive, in boxer-primed, reloadable brass cases.