This may be old news for some people, but it has not been mentioned here. Shun is launching a new line of knives with a blue steel (carbon steel) core enveloped in stainless steel. This allows a cutting performance of the blue steel, and the easy of care for the stainless steel. The core steel is hardened to 61 Rockwell. They also have octagonal handles (except the Menkiri knife), and are sold with knife saya (sheath). Based on Chefknivestogo information, it will be Blue 2.