ZWILLING J.A. Henckels presents the Four Star Flexible Boning Knife, a global icon of precision honed by master artisans. Precision-forged from a single piece of special formula steel, this Sigmaforge masterpiece uses an ice-hardened Friodur blade to ensure exceptional sharpness and rust resistance. A seamless transition from the black matte ergonomic handle to the classic bolster provides the exquisite balance and safety required for prolonged use. With a 15-degree edge angle and superior retention, this essential tool offers the durability every home chef deserves. It is a lifetime investment in performance, blending 280 years of German engineering into a culinary staple.