Shun Blue knives are for those home cooks and professional chefs who use their knives every day and need a little extra durability. The Japanese βBlue 2β carbon steel blade is known for its superior edge retention and durability. Shun Blue knives to hold a sharper edge for longer, but can be sharpened with ease when needed. Unlike other carbon steel knives, Shun Blue knives are crafted using traditional Japanese san mai blade construction; a layer of mirror-polished stainless steel surrounds both sides of the blue carbon steel cutting core, allowing your knifeβs blade to preserve its beautiful look without sacrificing quality.