Bach 5G (small shank) vs Bach 5GB (small shank)
Both mouthpieces share similar core dimensions — the differences are in the details.
Mouthpiece A
Bach 5G (small shank)
• Baritone / Euphonium
Cup diameter25.50 mm / 1.0039 in
Cup depthVery deep
Rim width—
Throat diameter7.00 mm / 0.2756 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 5GB (small shank)
• Baritone / Euphonium
Cup diameter25.50 mm / 1.0039 in
Cup depthVery deep
Rim width—
Throat diameter7.00 mm / 0.2756 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 25.50 mm / 1.0039 in.
Cup Depth
Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 7.00 mm / 0.2756 in, so resistance feel will be comparable.
Which is better?
Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.