The Suisin High Carbon line is crafted out of a single piece of Nihon-kou (Japanese carbon) steel with a welded bolster and composite wood handle. Knives with very hard blades tend to be difficult to sharpen, therefore, Suisin does not use the same steel as traditional Japanese knives in the forging process. This difference in carbon steel allows the Suisin High Carbon blades to have a professional grade edge retention that can be sharpened with ease.