Okinawa Sanshin (Three-Stringed Lute) Black Water Buffalo Plectrum - Size M Black Water Buffalo Plectrum - Size M This is a water buffalo plectrum for the Okinawa sanshin. It's probably the most common type used. This is a new item, not used! Length is approximately 66.5mm (reference measurement) The diameter of the finger hole is about 16mm. Weight is approximately 22-23g. The finger hole can be adjusted to fit your finger by filing it down. The plectrum you will receive may differ from the one in the photo, but it will be of similar quality. ※※※※ ※※※ I am selling sanshin and sanshin-related items.