Detail 01
16.75mm cup diameter
A wide rim. More lip vibrates, giving a fuller sound, but endurance drops if you are not used to it.

Independent shopping perspective
Gold-plated Denis Wick flugelhorn mouthpiece, 3BFL: wide 16.75mm cup, medium-deep, standard USA shank. For players wanting a broad, dark flugel sound.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
A wide rim. More lip vibrates, giving a fuller sound, but endurance drops if you are not used to it.
Detail 02
The main reason a flugel sounds like a flugel. Rounds off the attack and darkens the tone versus a trumpet cup.
Detail 03
Fits flugelhorns built to the American taper. European-taper horns need the F-series Medium European shank instead.
Detail 04
Fairly open. More air goes through, so volume comes easier at the cost of some resistance to lean on.
Detail 05
Narrow-to-medium. Better flexibility and slotting between registers, less cushion on long sets.
Detail 06
Warmer on the lip than silver and easier on skin that reacts to nickel or silver. Softer plating wears faster.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Cup depth. The 3BFL is medium-deep; the 3FL is deep. Same 16.75mm diameter, 5mm rim, 4.60mm throat and standard USA shank on both.
No. This is cut for a flugelhorn receiver. Trumpet shanks are a different taper.
Mostly feel. Gold sits warmer on the lip and avoids silver or nickel skin reactions. The cup dimensions drive the sound, not the plating.
The 4BFL is slightly smaller at 16.50mm with a 5.13mm rim. The 3BFL gives a wider cup and narrower rim, so more volume of sound and less cushion.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.