We created our "HONZUKURI" blade shape was with the Japanese sword in mind. We took the best attributes of the Japanese sword, invented a remarkably strong blade and cutting edge, and applied them to our knife. Both sides of the Honzukuri blade are convex. This cutting edge shape functions perfectly, however it is time consuming to produce and therefore expensive. As a result of our continued research, we came to the understanding that the angle along the very edge of the blade has a strong influence on its sharpness. So, we then began the work of developing our custom-grinding apparatus and as a result, the Shinogizukuri blade shape was born. As for our Shinogizukuri blade, each side of the blade is composed of 2 planes. Shinogi is the Japanese word that describes the line created by the meeting of two surfaces. With this manufactureing process, we had developed a completely new and advanced technology. We realized that the optimal blade edge angle is 30 degrees near the haft, and the optimal blade edge angle is 24 degrees near the top of the blade. We made the adjustment to a blade angle of 30 degrees near the haft in order to achieve improved toughness, because this is where the highest stresses occur.We then made the adjustment to a blade angle 24 degrees near the tip of the blade with the aim of superior sharpness in mind, because high stresses do not easily occur here. From haft to tip is pne continuous, gradually reducing angle. The result of our advanced manufacturing process, is a blade that's well suited to human use, and is highly recognized for its sharpness.