This Sugimoto Chinese Cleaver #6 measures 220mm by 110mm and has a thin blade for use in a wide variety of cutting tasks. The cleaver is hand crafted using methods that have been proven and developed over many years of production. Sugimoto cutlery has been making knives since the 1930s. After WWII they were the first company t begin producing western and Chinese style knives for the Japanese market. They make fine quality knives and hand finish each blade. These are extremely sharp knives and we are proud to add them to our line up of top quality knives. This cleaver is made of very hard white steel with a RC hardness of 62-63 and it will patina (turn dark) with normal use and also it will rust if you don't keep the cleaver dry after you clean it. Many people use camillia oil after use to prevent rust.