The Zwilling J.A. Henckel Twin Gourmet knife line has put the quality, function, handling, and precision ahead of all other knife competitors. The Twin Gourmet Series knives are classic 3 riveted knives, and are made from Henckel SigmaForge design. This SigmaForge design is precision forged from one solid piece of steel. The steel in a Henckel Twin Gourmet knife is made from a special formula of chromium and carbon, this will give a knife the hardness and sharpness, as well as durability and corrosion-resistant.