Authentically Japanese in design, each knife features 101 layers of steel-50 layers clad on each side of the Cryodur-hardened SG2 microcarbide steel core-forming a delicate Damascus pattern with a Rockwell hardness of 63. Each blade in the Birchwood collection is hand-honed using a traditional three-step honbazuke process. It's sharpened twice on whetstones with custom grits, followed by mirror polishing on a leather wheel. The genuine hamon edge-a visible line where flexible outer layers and incredibly hard core layer meet-is reminiscent of legendary Japanese swords. A hamon edge is a sign of superior craftsmanship. The D-shape of the natural Masur birch handle creates a comfortable grip and ensures tireless cutting, even with frequent use. Handle features an intricate mosaic center pin, red detailing, and engraved endcap. The chef's knife is the kitchen workhorse, letting you chop, dice, mince, and slice meat and vegetables in large quantities. Available in a variety of blade sizes to meet your needs. Hand wash. Sharpen with Miyabi sharpening stones. Limited lifetime warranty. Made in Japan.