Shop This Commercial Series Boning Knife has a standard flexible blade in a satin finish and a black Kray-Ex handle. Cold Steel’s Commercial Series was created to provide affordable kitchen cutlery for professional butchers, fishermen, hunters, and chefs. Summary of Cold Steel Commercial Series Flexible Boning Polymer Knife Black(Satin) CS 20VBBFZ Commercial Kitchen Series. 11.25″ (28.58cm) overall. 6″ (15.24cm) mirror finish 4116 stainless blade. Black handle has Zy-Ex core with food-safe Kray-Ex exterior.