Thank you for viewing. This is a Japanese flute (Shinobue) in the key of "Ni-hon-choshi" (two-tone). It is characterized by its ability to produce a deep, rich bass sound. The mouthpiece has been slightly widened, so it is not in new condition, but it is designed to make it easier to blow into. I purchased it from a festival supply store in Chichibu City. Total length: 546mm Outer diameter (around the mouthpiece): Approximately 70mm Mouthpiece size (vertical: horizontal): 14mm:12mm Purchase price (at the time): 15,000 yen