Simply designed and magnificently crafted, the Suncraft Senzo Pro Chef's Knife 210mm is built for performance. These knives feature a core of SG2 powdered steel clad with softer stainless steel. Super-hard SG2 steel stays remarkably sharp without being delicate. This is a robust steel that is built to perform in any environment. Senzo Pro knives offer the best edge retention at 63° HRC with a very tight grain structure for ultimate sharpness. The European style riveted handles are carefully shaped and comfortably finished. SG “Powder Stainless Steel” contains more carbon that traditional carbon steel knives ( Aogami , Shirogami ) but is also high in stainless elements. This means your knife will hold an extremely sharp edge for a very long time. This steel is extremely hard. The harder the steel, the more brittle it can be.