Aogami No.1 steel is a pure steel with fewer impurities than normal steel, and has the characteristic of being able to produce a much stronger hardness than Aogami No.2 steel. It is the best choice for those who are in the main profession, as well as for those who are looking for better sharpness and longevity of the blade.

Kurouchi Finish, the unprocessed (black) part on the top side of the blade has already developed a dark patina, which protects the blade and gives it a traditional Japanese look.