This series is called Tokujo which translates to "Especially Superior" and for more than 30 years this has been the Sakai Takayuki flagship line for pro cooks. They are masterfully ground with polished choils and natural stone kasumi finish. The sharpener for this series is Nishimura Norikatsu and the blacksmith is Togashi Kenji. We hope you give one of these "Especially Superior" knives a try.