Which has a bigger cup — Bach 5C or GR Technologies 3MS?

The GR Technologies 3MS has a cup diameter of 16.76 mm / 0.6598 in compared to 16.25 mm / 0.6398 in on the Bach 5C — a difference of 0.51 mm / 0.0201 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 5C and GR Technologies 3MS?

Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

Bach 5C vs GR Technologies 3MS

Name: GR Technologies 3MS
Brand: GR Technologies

The GR Technologies 3MS has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 5C

• Trumpet

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

GR Technologies 3MS

• Trumpet

Backbore—

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.