Detail 01
Top only
Rim and cup half. The shank that enters the horn is the backbore, sold separately.
Product detailSKU #1275776906574
WarburtonTwo-Piece Bass Trombone Mouthpiece System in Silver 4B Top Only
Independent shopping perspective
The Korena take
The 4B top half of Warburton's two-piece bass trombone mouthpiece, silver plated. For players on the system who want this rim and cup on their existing backbore.
Strong match
Who this is for
- Warburton players changing rim and cup without buying a whole mouthpiece
- Carrying two tops and one backbore in the case
- Comparing rim sizes against a fixed backbore
Consider the trade-offs
When to look elsewhere
- Players who do not already own a Warburton backbore
- Anyone who wants a sealed single-piece mouthpiece
- Tenor trombone or euphonium players
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
Two-piece system
Threaded halves mean one backbore can serve several tops, so trying a new rim costs less than a new mouthpiece.
Detail 03
4B designation
Marks this rim and cup size in the range. The 5B is a different size in the same family.
Detail 04
Bass trombone top
Made for bass trombone. Match it to bass trombone backbores rather than tenor parts.
Detail 05
Silver plating
Grippier on the lip than gold and durable, though it will tarnish if left uncleaned.
Detail 06
$139.99 for one half
A first-time buyer also needs a backbore, so budget for two parts.
Final check
Know before you order
- 01No backbore included — the top will not play on its own
- 02Confirm the backbore you own is Warburton bass trombone
- 03Keep the threads clean so the two halves seat fully
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Do I need anything else to play this?
Yes, a Warburton bass trombone backbore. The top supplies the rim and cup; the backbore supplies the throat and shank.
02How does the 4B compare to the 5B?
They are separate rim and cup sizes in the same bass trombone range. Choose by comparing each against the rim you currently use.
03Can I swap tops mid-rehearsal?
Yes. The halves unthread by hand, which is the reason players carry more than one top with a single backbore.
04Will the seam affect how it plays?
The halves thread together to form one bore. Seat them fully and snug by hand so there is no gap at the joint.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- Silver
