Which has a bigger cup — GR Technologies 67FD or GR Technologies 67FL?

Both mouthpieces have virtually identical cup diameters at 17.00 mm / 0.6693 in.

How does cup depth compare between GR Technologies 67FD and GR Technologies 67FL?

The GR Technologies 67FD has a deep cup while the GR Technologies 67FL has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

GR Technologies 67FD vs GR Technologies 67FL

Name: GR Technologies 67FL
Brand: GR Technologies

the GR Technologies 67FD 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 67FD

• Flugelhorn

Backbore—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Mouthpiece B

GR Technologies 67FL

• Flugelhorn

Backbore—

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.