Which has a bigger cup — GR Technologies 3M or Schilke 13A4a?

Both mouthpieces have virtually identical cup diameters at 16.76 mm / 0.6598 in.

How does cup depth compare between GR Technologies 3M and Schilke 13A4a?

The GR Technologies 3M has a medium cup while the Schilke 13A4a has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

GR Technologies 3M vs Schilke 13A4a

Name: Schilke 13A4a
Brand: Schilke

the GR Technologies 3M features a deeper cup.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

GR Technologies 3M

• Trumpet

Throat diameter—

Mouthpiece B

Schilke 13A4a

• Trumpet

Throat diameter3.66 mm / 0.1441 in

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.