Sugimoto have been making knives since the 1930s and where known in the beginning for making samurai swords. Over time Sugimoto have dedicated their time to making only the finest handmade knives and the kasumi superlative is no exception. Kasumi superlative is a special category for professional sushi and fish preparation chefs please be aware that due to the high purity of this steel, Kasumi Superlative will rust if not maintained properly.