YAMAHA-Mouthpiece Bass Trombone Signature Standard -Douglas Yeo-

YAMAHA-Mouthpiece Bass Trombone Signature Standard -Douglas Yeo-, rim inner diameter: 28.72mm, rim contour: semi-flat, rim thickness: semi-thin, cup depth: semi-deep, throat: 8.00mm, backbore: semi-wide, the Yeo mouthpiece features a large symphonic size cup for a big rich sound, it is characterized by a full, centered tone with a focused core and a brilliant, well-defined overtone series.