Detail 01
.658 inch cup diameter
Medium-small. Slightly narrower than a 13 or 14, which is part of why endurance improves.
Product detailSKU #1275776904510
SchilkeStandard Series Trumpet Mouthpiece Group I 12B4 Silver
1/8
Independent shopping perspective
The Korena take
Schilke 12B4 trumpet mouthpiece in silver. A .658-inch medium-small conical B cup with a semi-flat number 4 rim, aimed at endurance without going shallow.
Strong match
Who this is for
- Long rehearsals or services where lips give out before the music does
- Players wanting range help without a lead-piece shallow cup
- Moving off a plain 12 and wanting more rim support
Consider the trade-offs
When to look elsewhere
- Screaming lead work — the 12A4a's shallow cup and tight backbore fit that
- Players wanting maximum cup volume and a dark, broad tone
- Cornet — this is the trumpet model
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
B cup, conical shape
Medium-small depth. Keeps a full tone rather than the thin, bright sound of the shallow A cups.
Detail 03
Number 4 semi-flat rim
Flatter than a standard rim, so pressure spreads across more of the lip. Buys playing time.
Detail 04
26 throat
The standard throat here, not the tighter 27 used on the a-backbore models built for high-register work.
Detail 05
C backbore (standard)
More open blow than the 12A4a's tight a-backbore. Less resistance to push against.
Final check
Know before you order
- 01Check the model stamp you actually want — this group runs from 5A4 to 14A4x.
- 02Sold as a single mouthpiece; no pouch or holder in the box.
- 03A flatter rim can feel unfamiliar at first; expect an adjustment period.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What does the B in 12B4 mean?
Cup depth. B is a medium-small conical cup, deeper than the shallow A cups used for lead playing and shallower than the standard C depth.
02What is the 4 in 12B4?
The rim contour. Number 4 is a semi-flat rim, which spreads pressure over more lip surface and helps endurance compared with the rounder number 2 and 3 rims.
03How does the 12B4 compare to the 12A4a?
Same .658 inch diameter. The 12A4a swaps in a shallow A cup and a tight a-backbore for more range and endurance. The 12B4 keeps a fuller tone.
04Is this a lead mouthpiece?
No. For lead, the 13A4a pairs a shallow A cup, number 4 rim and tight a-backbore. The 12B4 is built around tone with rim support.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
5 detailsOther
- Category Source
- detail
- Tier
- new
- Korena Special
- false
- Source Id
- site51275776904510
- Prop65
- WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer, and to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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