Togashi Kenji is a highly experienced Sakai-based blacksmith. He is most famous for his honyaki or true-forged blades. These blades use a mono steel construction which is then differentially hardened. This basically means the edge is harder than the spine. The wave line, or hamon, seen on the blade face is an indication that the blade has been hardened in this way. These are the hardest knives to make and failure rate is high.