The Bach 5G is a very nice mouthpiece for both trombone and euphonium if one is playing in a wind band or a symphonic orchestra. The dimensions of the mouthpiece allow a good sound over a wide range: be it high or low notes, I can comfortably play them with this piece. Not the best choice if you want a really bright crisp sound for a solo, perhaps, but the darker, deeper, broad sound of the 5G is great for the orchestral player.