MAC Knives are manufactured in Japan using a custom high carbon, high molybdenum content, stainless steel alloy. The blend results in a most extraordinary alloy with a 60 degree Rockwell hardness that has good edge retention and is easy to resharpen. Mac knives feature razor sharp edges that are set at 15 degree angles, as opposed to the 20 degree edges preferred by the Germans. This flatter edge of a Mac Knife offers less resistance making the knife quicker and sharper. Charlie Trotter endorses Mac Knife Professional Series.