This precision knife set ideal for professionals and ambitious amateur chefs alike combines perfect functionality and ergonomics with unique design. How it's made: The blade core made of MicroCarbide MC63 powder steel is surrounded by 100 layers of two different types of steel with different levels of hardness. The CRYODUR(R) blade is hardened using a specially developed ice-hardening process at -196?C that guarantees extreme hardness of 63