I use this mouthpiece for Bb tuba.
I am satisfied with its workmanship and all its qualities.
As a musician who plays the tuba as a second instrument(first euphonium), his size is perfect for me.
Despite its relatively small size, it manages to keep the tone solid and rounded.
For me, the only insignificant drawback is that the mouthpiece is a bit thin at the end, which is typical for this price range, but this does not affect playing with it.
I think this is a perfect mouthpiece for those who want to double the tuba and the euphonium.