Detail 01
16.50mm cup diameter
Mid-size in this family — narrower than the 17mm 2BFL, wider than the 16mm 5BFL. Affects endurance and flexibility more than tone.
Product detailSKU #1274228081310
Denis WickDW5884 Classic Series Flugelhorn Mouthpiece in Silver 4BFL
1/2
Independent shopping perspective
The Korena take
Silver-finish 4BFL flugelhorn mouthpiece: 16.50mm cup, medium-deep, standard USA shank. For players wanting flugel warmth on a mid-size rim rather than a wide one.
Strong match
Who this is for
- Flugelhorns with a standard USA shank receiver
- Players wanting warmth without giving up the upper register
- Section work where blend matters more than edge
Consider the trade-offs
When to look elsewhere
- Horns needing a medium European shank — the 4F covers that
- Players chasing a bright, shallow response; the 5EFL is shallower
- Anyone settled on a 17mm rim like the 2BFL
What matters in use
The specifications, translated
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 02
Medium-deep cup
Sits between the deep FL cups and the shallow 5EFL. Keeps flugel darkness without dragging down the upper register.
Detail 03
4.60mm throat
Wider than the 5BFL's 4.50mm. More air moves through, so the low end fills out and blowing feels freer.
Detail 04
5.13mm rim width
Middle of the range. Wider rims spread pressure and help endurance; narrower ones give more lip flexibility.
Detail 05
Open backbore
Low resistance and a broad sound, as opposed to the V-type backbore on the shallow 5EFL.
Detail 06
Standard USA shank
Has to match your receiver. The F-series in this line uses a medium European shank instead and won't seat the same.
Final check
Know before you order
- 01Check your receiver first — USA shank here, not medium European
- 02A rim change takes a week or two to settle into
- 03Mouthpiece only; plan on your own pouch or case
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will this fit my flugelhorn?
If your horn takes a standard USA shank, yes. If it takes a medium European shank, look at the 4F instead — same 16.50mm cup and 5.13mm rim, deep cup.
02How does 4BFL differ from 3BFL?
The 3BFL is 0.25mm wider at 16.75mm with a slightly narrower 5mm rim. Same medium-deep cup, same 4.60mm throat, same USA shank.
03What if I want a deeper sound?
The 4FL has the same 16.50mm diameter, rim and throat but a deep cup instead of medium-deep. Same standard USA shank, so it's a direct swap.
04Can I use this on a trumpet?
No. It's cut for a flugelhorn receiver and won't seat properly in a trumpet.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- Silver
12 detailsOther
- 5bfl
- Standard USA shank; Medium-deep cup; 16mm cup diameter; 5.30mm rim width; 4.50mm throat; Open backbore.
- 3bfl
- Standard USA shank; Medium-deep cup; 16.75mm cup diameter; 5mm rim width; 4.60mm throat; Open backbore.
- 4bfl
- Standard USA shank; Medium-deep cup; 16.50mm cup diameter; 5.13mm rim width; 4.60mm throat; Open backbore.
- 2bfl
- Standard USA shank; Medium-deep cup; 17mm cup diameter; 4.88mm rim width; 4.60mm throat; Open backbore.
- 5efl
- Standard USA shank; Shallow cup; 16.50mm cup diameter; 5.30mm rim width; 3.90mm throat; V-type backbore.
- 4f
- Medium European shank; Deep cup; 16.50mm cup diameter; 5.13mm rim width; 4.60mm throat; Open backbore.
- 3f
- Medium European shank; Deep cup; 16.75mm cup diameter; 5mm rim width; 4.60mm throat; Open backbore.
- 2f
- Medium European shank; Deep cup; 17mm cup diameter; 4.88mm rim width; 4.60mm throat; Open backbore.
- 2fl
- Standard USA shank; Deep cup; 17mm cup diameter; 4.88mm rim width; 4.60mm throat; Open backbore.
- Sfl
- Standard USA shank; Medium cup; 16mm cup diameter; 5.30mm rim width; 4.50mm throat; Open backbore.
- 3fl
- Standard USA shank; Deep cup; 16.75mm cup diameter; 5mm rim width; 4.60mm throat; Open backbore.
- 4fl
- Standard USA shank; Deep cup; 16.50mm cup diameter; 5.13mm rim width; 4.60mm throat; Open backbore.
