The Genbu, recalling a Japanese sword feature, is made by the skilled blacksmith Itsuo Doi. He is a son of legendary blacksmith Keijiro Doi, whose family has produced some of the finest hand-forged knives for more than 70 years.
The Aoko or Blue Paper (Aogami) No.2 Steel Knife is made from famous Yasugi steel, known as prime high carbon steel, specifically developed for tools and knives.
This one has highest wear resistance and toughness. Very good steel, and very popular choice for high end Japanese kitchen knives. We recommend any professional chef to use the one in their life.