The Bohler M390 is a top-of-the-line stainless steel used in the production of high-quality knives. It is known for its exceptional edge retention and resistance to corrosion. Despite its impressive performance, it is relatively easy to sharpen. This steel is a popular choice for both mass-produced and custom knives. However, it is worth noting that its high carbide content and coarse microstructure make it slightly less tough compared to other options.