Professional"S" are the classic knives for the professional kitchen. The knives are made of proprietary special formula steel that has been perfected for over 280 years. Combined with Zwilling's signature ice-hardening technique, these Friodur blades are harder, sharper, they will not stain or chip and they retain their sharpness longer. Honed and hand-finished by the most skilled artisans, the knives' laser-controlled edge is incredibly sharp. The sturdy bolster provides the right balance and acts as a finger guard. Precision-forged from a single piece of solid steel, these three rivet handle knives deliver optimum balance and safe handling. Professional chefs worldwide trust the tradition and quality of these impressive knives.