Bach 5C vs GR Technologies 63Z*
The Bach 5C has a wider cup diameter, the Bach 5C features a deeper cup.
Mouthpiece A
Bach 5C
• Trumpet
Cup diameter16.25 mm / 0.6398 in
Cup depthMedium
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
GR Technologies 63Z*
• Trumpet
Cup diameter16.00 mm / 0.6299 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Lead / commercial — shallow cup for brightness and range
Cup Diameter
The Bach 5C has a cup diameter of 16.25 mm / 0.6398 in compared to 16.00 mm / 0.6299 in on the GR Technologies 63Z* — a difference of 0.25 mm / 0.0098 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 5C has a medium cup while the GR Technologies 63Z* has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.