What is real rayskin (samegawa) and why is it used on handles?
Updated Mar 2026
Samegawa refers to the skin of rays, specifically the spotted ray, which has been used in Japanese fittings work for centuries. The surface of ray skin is covered in small, calcified nodules called denticles that give the material a naturally textured, non-slip grip. On black handle aikuchi, the skin is either dyed black or selected from naturally darker specimens, and it may be used as a full wrap or as underlayer panels beneath cord wrapping. From a collector's perspective, samegawa is significant because no two pieces share identical nodule patterns — the central boss node in particular varies in size and placement, making each handle unique. It is also extremely durable, resisting compression and wear far better than synthetic alternatives.