Our signature KURO (黒) DAMASCUS STEEL has a unique pattern that is more pronounced than our standard Damascus Steel. Kuro Damascus is made by blending two different kinds of stainless steel, 304 and 316. As skilled artisans twist and fold these metal layers it becomes stronger and more durable, uniting them to create a one-of-a-kind pattern. Much like a great marriage, Damascus requires work to unite the individual layers together, but the result is worth the effort. Each Damascus Steel ring is unique—no two designs will look exactly alike. These rings are very hard and durable and have some customization available.