Messermeister Four Seasons Semi-Flexible Curved Kullenschliff Boning Knife, 6-Inch The German 1.4116 high-carbon, stainless alloy blade resists stains and corrosion, exhibits toughness and durability, holds its edge retention, and is easy to re-sharpen to a razor-like edge. This knife line is one-piece stamped, which produces a strong blade from heel to tip. The blades are heat treated and cooled to achieve a Rockwell of 56-57. The over-sized, hygienic, molded, seamless polypropylene handles provide comfort for the extreme demands of a commercial kitchen. Handcrafted in Santa Catarina, Portugal. The Knife for Life guarantee provides a lifetime warranty against material and manufacturing defects.