Bob Reeves 43.5/F vs Bob Reeves 43N/F
The Bob Reeves 43.5/F has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bob Reeves 43.5/F
• Flugelhorn
Cup diameter17.26 mm / 0.6795 in
vs
Mouthpiece B
Bob Reeves 43N/F
• Flugelhorn
Cup diameter17.07 mm / 0.6720 in
Cup Diameter
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.
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.