This series 'River Jump' is made with a #2 white steel core and an iron cladding forged with an unusual half twist design, rather than the more common sandwiched layering of a hon kasumi knife this series is made with the hagane cutting layer core with the iron jigane folded around it.
Hand forged, finished and sharpened in Sanjo Niigata Japan by third generation knifemaker Tsukasa Hinoura. Hinoura-San uses no modern machinery in the production of his knives, from the forging of the jigane to the final whetstone finish traditional materials and techniques are employed.
Hinoura-San is famous for his heat treatments as well as the beauty of his forging, so much of what a knife does comes down to geometry and heat treatment, both of which are amazingly refined in this series, a distal taper and fine long bevel make for smooth cutting and great edge life. It should be emphasized that these are not stainless and must be kept dry and oiled when not in use.