Which has a bigger cup — Bach 1¼C or GR Technologies 3M?

The Bach 1¼C has a cup diameter of 17.00 mm / 0.6693 in compared to 16.76 mm / 0.6598 in on the GR Technologies 3M — a difference of 0.24 mm / 0.0094 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 1¼C and GR Technologies 3M?

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

Bach 1¼C vs GR Technologies 3M

Name: GR Technologies 3M
Brand: GR Technologies

The Bach 1¼C has a wider cup diameter.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 1¼C

• Trumpet

Finish—

Mouthpiece B

GR Technologies 3M

• Trumpet

Finish—

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.