Just a little FYI. There are many steel mills located around the world, but only a select few are able to produce steel that is hard enough and of sufficient quality to be safely used for steel targets. HARDOX/SSAB, Bethlehem-Lucas, Oregon Steel Mills and NKK are major producers of such steel. Steel must be through hardened not just surface hardened. AR500 Brinell and AR550 Brinell Heavey Duty Armor Steel. Being 3/8 has no bearing on the quality of the steel. This product is being advertised as AR 500 3/8 and that is what it is.