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. The Endura4 features a full flat ground ZDP-189 steel blade, a Green FRN Bi-Drectional Textured Handle, four-way clip option, screw-together construction, skeletonized steel internal liners, phosphor bronze washers, David Boye Dent, spine jimping, and an enlarged opening hole.