I really feel dumb tonight, there was a company that made shells with NO BRASS at all. I just can't remember the name right now, but they functioned fine. The brass is generally brass plated steel and is more for decoration than anything,. I am surprised the ammo companies spend the money to put it on as it really serves no purpose as it is way too thin to hold much pressure. They could lower the cost to us,, or as most companies, increase the profits eliminating the cost of the "brass".