Wusthof Classic Ikon 9-Inch Cook's Knife, Black Comfortable and highly-durable polyoxymethylene (POM) handle with a traditional look and feel, stickered with our Trident logo Precision Edge Technology (PEtec) yields a blade that is 20% sharper with twice the edge retention. Tempered to 56 Rockwell CLASSIC knives are made of high-carbon stainless steel. Ergonomic handle design developed in consultation with professional chefs.