Thanks to a collaboration with our bladesmith, we are able to offer you this new line. The blade core is white paper steel inserted into the exterior cladding and is called san mai construction. The blades are heat treated by hand and hand ground using modern blacksmithing techniques. HRC on these knives is HRC 61 and they sharpen easily with excellent performance. The D shaped handles are made from sandlewood with black pakka wood ferrule. They also have a very nice and attractive hamon pattern on the lower part of the blade.