Which has a bigger cup — GR Technologies E62FD or GR Technologies 63FD?

The GR Technologies 63FD has a cup diameter of 16.00 mm / 0.6299 in compared to 15.75 mm / 0.6201 in on the GR Technologies E62FD — a difference of 0.25 mm / 0.0098 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between GR Technologies E62FD and GR Technologies 63FD?

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

GR Technologies E62FD vs GR Technologies 63FD

Name: GR Technologies 63FD
Brand: GR Technologies

The GR Technologies 63FD 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 E62FD

• Flugelhorn

Throat diameter—

Mouthpiece B

GR Technologies 63FD

• Flugelhorn

Throat diameter—

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.