This is a mouthpiece made by Toshi Kameyama (Toshiaki Kameyama), who worked on mouthpieces for famous players such as Maurice André and Eric Miyashiro during his time at Yamaha Atelier. The rim is about the size of a Bach 7, and the cup is about E to F. This mouthpiece is popular for horn sections that require high notes and endurance. It has a good response and a bright,華やかな sound. It feels like the vibrations inside the cup are transmitted to the instrument. It's designed for easy high notes, but it doesn't sound too harsh, producing a refined, mellow sound.