Machined from: Vacuum hardened American tool steel 51-53 Rc hardness. After looking into several manufacturing methods, we decided to fully machine the hammers from solid, the method we use for our popular hard sear, long ball head disconnector, slide stops and thumb safeties. The accuracy of the hammer is impressive. Using one hold to machine and ream the holes, mill the profile, cut reliefs and slice the hammer means that all these operations will be within .0005″ for a true and square hammer. The tank treads for cocking serrations look Heavy Duty and are functional without adding stress risers. The slot through the top adds a distinctive looks and make the hammer lighter. We have two variations on our hammer, lightened or solid- our lightened hammer weighs in at 10.7 grams (165 grains). We are unable to ship this item outside of the United States. If this item is purchased as part of an international order, the item will be removed from the order. The account will be refunded for the item, and the remainder of the order will ship.