This is a mouthpiece for a bass trombone from Brass Lab. Momo. The model is 60☆. I bought this a while ago, so I don't remember if it was from the Atelier Momo era or the Brass Lab. Momo era. I used it for about a month, so there are some scratches on the shank, but otherwise, it's clean. I will ship it via Yamato Transport.