Masakage shimo petty 150mm. Masakage Shimo knives offer a unique suminagashi patterned steel made by Kurosaki san. This series is named Shimo (frost) because the blade looks like frost on a window. The steel used is Shirogami #2 (white #2) and the blades are hardenedd to Rockwell Hardness 61:63. These knives come with octagonal handles of Magnolia wood with black pakka wood ferrules.