Wagaran (Japanese pattern) koto plectrum and case set. - Included: Koto plectrums (3) Purchased new for a university club and used for one year, then stored on a shelf. One of the koto plectrums has had the black color of the ring worn off due to frequent use. The size and material of the plectrums are unknown. This is a used item, so please purchase only if you understand this.