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

Mouthpiece A

GR Technologies 3M

• Trumpet

Backbore—

Mouthpiece B

Schilke 13A4a

• Trumpet

Backbore27

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.