The Crucible 154CM knife is made from a high-quality stainless steel that was originally designed for use in bearings. It is an upgraded version of the popular 440C steel, with the addition of molybdenum for enhanced resistance to corrosion and improved hardness. This means that the knife will maintain its sharp edge for longer periods of time and is less likely to develop pits from corrosion. The toughness of the Crucible 154CM is comparable to that of the Hitachi ATS-34 steel, making it a reliable and durable choice for any knife enthusiast.