Greg Black 4.5GSD Trombone Mouthpiece

This is a Greg Black large bore tenor trombone mouthpiece, model 4.5GSD. It comes with gold plating from the factory. There are marks on the shank, but they do not affect playability.

Cup inner diameter: 25.95mm
Cup depth: Medium (between 4.5G and 4.5GS)
Regular weight