Richmond Hamon 110mm Petty. For those of you that are fans of hamon patterns we came up with a unique line of knives that feature a nice hamon pattern that the maker calls electro cardiogram. It's very unique. The blades are made using blue paper #1 steel. HRC is 61-62 and they are stiff with nice height for a petty. Handle is bubinga and wenge and is done by our master woodworker, Isaiah Schroeder.