The highest-class series of Misono knives has HRC 59-60 hardness just like high-carbon steel knives. Double edged blade. The hollow edge or dimpled edge allows for an effortless cut through foods without worrying about it sticking to the blade. Use & Care Hand wash. Background Seki City in Gifu Prefecture is one of the most well-known and highly regarded blade-producing areas in the world. Misono Cutlery Co Ltd. produces high-level professional use knives with their traditional craftsmanship and modern technology in Seki City, the city with 800 years of history in knife crafting.