The Aogami Super steel which is used for the core of these knives is seen as one of the best performing steels used for Japanese kitchen knives by many blacksmithes. The dark Kurouchi finishing is a hard work of art but leaves a highly performing, long-lasting and beautiful knife in return.
Core: Aogami Super steel, hardened to HRC64-65.
Cladding: Carbon steel
Finishing: Suminagashi-Tsuchime (hammered)
Blade: Distal tapered, which leads to a better balance of the knife.
Handle: Made of rosewood Shinogi shape, which is very dirt-resistant and robust, with packer wood bolster.

A petty (utility) knife probably gets used most often after your all-purpose knives. It can be used to cut small fruits, vegetables, and even some smaller cuts of meats (any many many more things, like cutting through plastic wrapping from a grocery trip!) If you have one, for a quick meal for two, you may just get it done without a chef's knife.