The surgical steel was primarily developed for Airbus and is today used in surgery for highly loaded parts – as bone screws – as well as in watchmaking. Throughout the fine structure a very high durability can be achieved and therefore the grind of the knife is much thinner. By replacing carbon with nitrogen it increases the corrosion resistance by factor four. Thanks to high hardness of 58 HRC, which is in the range of the Japanese knives, the knife stays sharp for a very long time. Besides the surgical steel we use a torsion damask steel that is treated with two of the best knife steels with up to 1‘000 layers per knife.