The special feature of the of the SOUL collection is the unique alloy of the blade steel. The patented Nesmuk steel contains the rare element Niobium. This ensures the finest possible steel structure despite the chance of rusting. A higher strength is achieved, the blade is tougher and stronger. The tested steel hardness is 60HRC. The result is an increased service life of the knife and cutting durability. The combination of the fine steel structure, the unusually ground thin blades and the craftsman's precision in the manufacturing process, achieves extreme sharpness that separates Nesmuk from conventional knives.