The development of the *****FIVE STAR knives involved professional chefs. The result is very special: ergonomically designed handles in an outstanding design prevent tiring. J.A. Henckels TWIN Five Star knives are precision forged from a single piece of exclusive-formula, high-carbon, no-stain steel under the all-new SIGMAFORGE standard. As a result, TWIN Five Star knives have improved quality consistency, lasting sharpness, and perfect geometry. (U.S Patent 5791055) Manufactured in Germany.