Which has a bigger cup — Bob Reeves 43/F or GR Technologies 66.5FL Almeida?

The Bob Reeves 43/F has a cup diameter of 17.07 mm / 0.6720 in compared to 16.89 mm / 0.6650 in on the GR Technologies 66.5FL Almeida — a difference of 0.18 mm / 0.0071 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves 43/F and GR Technologies 66.5FL Almeida?

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

Bob Reeves 43/F vs GR Technologies 66.5FL Almeida

Name: GR Technologies 66.5FL Almeida
Brand: GR Technologies

The Bob Reeves 43/F has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bob Reeves 43/F

• Flugelhorn

Rim width—

Mouthpiece B

GR Technologies 66.5FL Almeida

• Flugelhorn

Rim width—

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.

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Bob Reeves 43/F vs GR Technologies 66.5FL Almeida

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