The product has been changed to a Masamitsu-made silver-3 steel Deba knife, 7 sun (210mm). This is a Deba knife made by Masamitsu. Silver-3 steel (Yasuki Steel Silver Paper) is used for the steel, providing excellent sharpness and rust resistance. Please use it at home or at work. Length: 290mm Spine thickness: 7mm Blade length: 150mm Weight: Approximately 237 grams (Please note that there may be variations due to being handmade.) Please purchase with understanding. Those who are overly concerned should refrain from purchasing. "Silver-3 steel" is a traditional stainless steel that has been widely used in the world of Japanese knives for a long time, and it is a steel material trusted by chefs even in Japanese knives that require sharpness. Hitachi Metals, which manufactures Yasuki steel such as white steel and blue steel, created silver paper steel as a rust-resistant stainless steel, and among them, this silver-3 steel has increased carbon content and hardness. It is a steel material that retains its sharpness even among stainless steels, so it is a knife suitable for those who use it for long hours.