Which has a bigger cup — GR Technologies 64SZ or Schilke 13A4a?

The Schilke 13A4a has a cup diameter of 16.76 mm / 0.6598 in compared to 16.26 mm / 0.6402 in on the GR Technologies 64SZ — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between GR Technologies 64SZ and Schilke 13A4a?

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

GR Technologies 64SZ vs Schilke 13A4a

Name: Schilke 13A4a
Brand: Schilke

The Schilke 13A4a has a wider cup diameter.

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 64SZ

• 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.