Twin Four Star II 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 Four Star II 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 Four Star II knives use J.A. Henckels's Friodur ice hardening for corrosion resistance, a process that also contributes to cutting-edge retention.
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