To accommodate a wider range of musical styles, we also offer plated steel materials with a bright and consistent tone, non-plated steel materials (N) with a pure and broad tone, phosphor bronze materials (P) with many overtones and a transparent tone, cast brass materials without bending stress (B), and hammer-type materials (HH) with a rich instrument's own tone. (HH), available in 6-inch, 8-inch and 10-inch sizes.
About the triangles N and P types are made of phosphor bronze, a type of steel, without coating to avoid spoiling the unique sound of the product. The surface may oxidize, but it will not affect the "sound".