Detail 01
Deep cup
The main reason a flugel sounds like a flugel — rounder and darker, with less edge and a harder upper register.

Independent shopping perspective
Deep-cup flugelhorn mouthpiece on a USA shank with a mid-sized 16.50mm cup. For players who want the flugel to sound clearly unlike a trumpet.

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
The main reason a flugel sounds like a flugel — rounder and darker, with less edge and a harder upper register.
Detail 02
Middle of the FL range, between the 16mm 5BFL and the 17mm 2FL. Close to familiar territory for most trumpet players.
Detail 03
Fits USA-taper receivers only. European horns take the 4F, which has identical cup, rim, and throat dimensions.
Detail 04
Air moves freely and the sound spreads and blends rather than projecting as a narrow beam.
Detail 05
Standard across this line. Moderate resistance — enough to control quiet playing without feeling stuffy when you push.
Detail 06
Grippier under the lip than gold and slower to slide when you're sweating. Wears at contact points over years.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
It's a standard USA shank. If your horn takes a medium European shank, buy the 4F instead — same 16.50mm cup, 5.13mm rim, and 4.60mm throat in that taper.
FL is a deep cup on a USA shank. F is the same depth on a medium European shank. BFL is medium-deep on a USA shank. EFL is shallow.
The deep cup takes more air and costs some upper register. The 4BFL is medium-deep with the same 16.50mm cup and 5.13mm rim, so it responds easier.
The deep cup and open backbore both push that direction, and this is the darker end of the range. How far you get also depends on the horn and your air.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.