Traditional hardening way “ 火造り HIZUKURI ” is that blades are hardened in a furnance bursting into flame. Then blades are forged by hands of skilled fire smiths. The number of fire smiths is decreasing very much and getting old. We are concerned about that these knives will be lost from Japan in the near future. Actually these knives would rust easily and the finish might be rough. On the other hand, they do cut very well, and remind us “Good old days of Japan”.