Our unique coating technology coats all of the strings, both wound and plain strings with a high carbon steel core, resulting in unprecedented longevity. Boasts high performance in terms of strength, pitch stability, and corrosion resistance not found in conventional coated strings. All strings, including plain strings, are coated with a micro-polymer coating. Due to design changes by the manufacturer, external design, color, specifications, etc. may change without prior notice. This product is a product from a distributor in Japan (the product cannot be guaranteed by a distributor).