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, Henckels Five Star knives have improved quality consistency, lasting sharpness, and perfect geometry. Sigmaforge one-piece construction also provides high precision and improved stability of the blade and steel structure, thus improving cutting-edge retention for lasting sharpness. In addition, Twin Five Star knives use J.A. Henckels' Friodur ice hardening for corrosion resistance, a process that also contributes to cutting-edge retention. The Five Star handle is an exclusive and patented J.A. Henckels design. The ergonomic handle is perfectly proportioned with a new open flow to accommodate each individual hand while improving convenience and safety for the user. These comfortable, high impact polypropylene handles are sanitary, break-proof and colorfast. Made in Germany, Lifetime Warranty.