Ultimate series of Tojiro lines - High Speed Powdered Steel blade hardened to Rockwell HRC62 to 63. Very hard steel, yet high resistant to brittleness and has longer edge retention, made possible by modern metallurgical technology of vapor metal alloys. Clad with 13 chromium stainless steel to prevent rusting and easy maintenance. Full tang construction permanently riveted with Black Staminawood handle with stainless steel bolster. Recomended for professional chefs.