Which has a bigger cup — GR Technologies 63S or Schilke 13A4a?

The Schilke 13A4a has a cup diameter of 16.76 mm / 0.6598 in compared to 16.00 mm / 0.6299 in on the GR Technologies 63S — a difference of 0.76 mm / 0.0299 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between GR Technologies 63S and Schilke 13A4a?

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

GR Technologies 63S 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

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

Mouthpiece A

GR Technologies 63S

• Trumpet

Finish—

Best suited for

🎺Lead / commercial — shallow cup for brightness and range

Mouthpiece B

Schilke 13A4a

• 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.