Also called R2 Steel, SG2 Semi-Stainless Steel is created using traditional methods of craftsmanship blended with modern metallurgy at high temperatures to form a durable steel composition suitable for industrial machinery and power tools. With a HRC Scale of 63-64, this knife will maintain a superior edge for an extended period. SG2 Semi-Stainless Steel is a high carbon steel known for maximizing cutting performance and edge retention. It has exceptional edge retention and allows for easier sharpening. Perfect for professionals with high-volume prep work. The Kiritsuke is an essential and versatile knife for cooks. Made in Japan with traditional handcrafted Octagonal Handle. Includes a Saya wooden sheath for protection and aesthetic appeal. Each knife from Yoshihiro is handcrafted, making it a unique work of art. Traditional Japanese knife making values a sharp edge and requires care. Sharpen and hone with water whetstones only. Hand wash and dry promptly, especially after cutting acidic ingredients. Avoid using on bones, nutshells, and frozen foods.