What is ray-skin on a tanto handle, and why does it matter?

 Updated Mar 2026

Ray-skin, called same-gawa in Japanese sword terminology, is the dried and treated skin of a stingray that is traditionally wrapped beneath the handle cord on Japanese blades. The small, pearlescent nodules on the skin's surface create a naturally textured grip base that prevents the cord wrap from slipping under pressure. For collectors, same-gawa also adds a subtle iridescent visual quality that shifts slightly depending on light and viewing angle — particularly noticeable on teal or light-colored panels. Historically, the quality and size of the nodules indicated the grade of the same-gawa used. On display pieces, it is one of those close-inspection details that separates a carefully assembled tanto from a simplified reproduction.

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