Kanetsune Fruit Knife. ABOUT KANETSUNE SEKI. Blade Steel: 420J2 Stainless Steel. Blade Length: 3.74" (95mm). Seki City, the City of Blades, is the 800-year-old blade capital of the Orient. Established in 1948 in Seki City, the City of Blades, we continue to provide traditional swords, knives, kitchen knives, and scissors.