ZWILLING Four Star Flexible Boning Knife

Built for the Cut That Matters Most

When clean separation between meat and bone is non-negotiable, the ZWILLING Four Star 5.5" Flexible Boning Knife steps up. Its long, thin, flexible blade navigates joints and contours with remarkable accuracy, giving home cooks and seasoned chefs alike the control they need for precise trimming and butchery work.

German Engineering, Nearly 300 Years in the Making

ZWILLING's SIGMAFORGE process shapes each knife from a single piece of proprietary high-carbon stainless steel — a formula refined over nearly three centuries. The blade then undergoes ZWILLING's exclusive FRIODUR ice-hardening technique, resulting in a sharper, harder edge that resists staining and chipping while maintaining its sharpness far longer than conventionally hardened blades. A precision-honed, laser-controlled V-edge ensures every slice is effortlessly clean from the very first use.

The ergonomic black matte polypropylene handle with a concealed tang sits comfortably in hand during extended prep sessions, reducing fatigue without sacrificing control. Rated at 57 Rockwell Hardness (55–58 HRC range), this knife delivers outstanding edge retention in a design that's dishwasher safe — though handwashing is recommended to preserve peak performance. Proudly made in Germany.