Griego Mouthpieces Model GP7 Bass Trombone
Griego Mouthpieces Artist Series Bass Model GP7; mouthpiece for bass trombone; cup diameter: Ø 29,2735mm (1.1525""); throat: .306""; the throat and cup depth is also the same size as on the GP and GP6; the GP7 may be the solution if you just keep asking for something bigger; bass trombone shank; silver plated