Alto Trombone Mouthpiece Tilz Domus Model 3 Cup Inner Diameter: 25.0mm Cup Volume: Shallow Throat Diameter: 5.0mm This is the signature model of the late Johann Doms, former principal trombone player of the Berlin Philharmonic Orchestra and a master of Boléro. There are some scratches on the shank from attaching and detaching the mouthpiece, but there are no scratches or dents that affect playing. It is a beautiful item, but please understand that it is used, and purchase accordingly. ⭐︎Please also read the profile.