The knife industry is constantly pushing the envelope searching for, and testing, higher performance blade steels. ZDP189 is rapidly asserting itself as an up-and-coming steel. It's a powdered metal made by Hitachi that has phenomenal chemistry with 3% carbon. The hardness is around 64Rc and Edge retention is exceptional. This solid ZDP-189 steel blade is the hottest, hardest and highest performing steel in the knife industry today.