This is a rare mouthpiece suitable for both contrabass and bass tuba. Selling due to instrument replacement. It has a damaged shank with a dent, so it's being sold at a bargain price. I don't think it affects the sound (just my opinion). An all-around mouthpiece that can be used for solos on F tuba or in orchestras on C tuba. Despite the shallow cup, it has a deep tone and flexibility to cover a wide range. ○ Finish: Silver plated, ○ Rim inner diameter: 32.44mm, ○ Rim contour: Slightly flat, ○ Rim thickness: Standard, ○ Cup depth: Slightly shallow, ○ Backbore: Standard, ○ Throat diameter: 7.5mm This mouthpiece was created through repeated discussions between Sergio Carolino and brass instrument technicians Thomas Lubitz of Yamaha Atelier Hamburg and the Japanese design team. At the request of Mr. Carolino, who performs in a variety of ways that defy tuba conventions, this is an all-around specification that can be used not only in wind bands and orchestras but also for solos and ensembles. It has high potential to meet the demands of high-end users who want to express deeper music through the tuba.