Knife Features → Blade Material: SG2 (R2) Semi-Stainless Powdered Steel →Edge Angle: Double Edged →Grade: R2 Powdered Steel →Handle Shape: Octagonal →HRC:63-64 →Knife Style: Kiritsuke Multipurpose Chefs Knife →Saya Cover: Lacquered Magnolia Wood Cover →Stain Resistant: Yes Also known as R2 Steel, SG2 Semi-Stainless Steel is forged with traditional methods of craftsmanship blended with modern metallurgy at extremely high temperatures to create a steel composition that is durable enough to be used in industrial machinery and power tools. With a HRC Scale of 63-64, this knife will make and keep its superior edge for an extreme period of time. SG2 Semi-Stainless Steel is a high carbon steel that sits at the pinnacle of maximizing cutting performance and edge retention like no other before it. It is well known to have excellent edge retention, and its low wear resistance allows for much easier sharpening. It is perfect for those professionals who have daily high-volume prep work for extended hours.Proudly made in Japan and not mass produced. This knife is complimented with a traditional Japanese Wa-style handcrafted Octagonal Handle that is lightweight and ergonomically welds to the hand for seamless use. A protective wooden sheath called a Saya is included, which protects the knife and adds to its appearance when not in use. Every knife from Yoshihiro is handcrafted by master artisans creating a unique one-of-a-kind work of art. Traditional Japanese knife making values a sharp edge, which requires attention and care. Sharpening and honing should be done with only water whetstones. Hand wash and dry only, and do so immediately if working with acidic ingredients. Do not use on objects such as bones, nutshells, and frozen foods.