Which has a bigger cup — Bob Reeves 43.5/F or Bob Reeves 43N/F?

The Bob Reeves 43.5/F has a cup diameter of 17.26 mm / 0.6795 in compared to 17.07 mm / 0.6720 in on the Bob Reeves 43N/F — a difference of 0.19 mm / 0.0075 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves 43.5/F and Bob Reeves 43N/F?

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

Bob Reeves 43.5/F vs Bob Reeves 43N/F

Name: Bob Reeves 43N/F
Brand: Bob Reeves

The Bob Reeves 43.5/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 43.5/F

• Flugelhorn

Rim width—

Mouthpiece B

Bob Reeves 43N/F

• 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.