Detail 01
5C cup depth (C = medium)
Balanced. Enough depth for a full low register without making high notes a fight. The all-purpose choice.
Product detailSKU #1274115059712
BachCornet Mouthpiece Group I 5C
Independent shopping perspective
The Korena take
A medium-depth cornet mouthpiece for general playing. The default choice for brass band, concert band, and student cornet.
Strong match
Who this is for
- Concert and brass band cornet across the full range
- Students moving off a stock mouthpiece
- Doublers who want cornet feel close to their 5C trumpet piece
Consider the trade-offs
When to look elsewhere
- Lead players who need a shallow cup for screaming highs
- Trumpet players — the shank will not fit the receiver
- Anyone chasing a specifically dark or specifically bright extreme
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
5 rim size
A medium diameter, slightly larger than a 7. More lip in the cup means fuller tone but shorter endurance.
Detail 03
Cornet shank
Shorter and narrower than a trumpet shank. It seats in a cornet receiver only — no adapter included.
Detail 04
Group I designation
Bach's cornet series marker, not a size code. The number and letter are what determine how it plays.
Detail 05
Conical instrument pairing
Cornet bore is conical, so the mouthpiece is designed for that mellower response rather than trumpet brightness.
Final check
Know before you order
- 01Mouthpiece only — no pouch or cleaning brush included
- 02Confirm your cornet takes a standard shank, not a short shank
- 03A 5 rim after a 7 will feel bigger; endurance drops before it recovers
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will this fit a trumpet?
No. Cornet shanks are shorter and narrower. It will sit loose or fail to seat in a trumpet receiver, and shank adapters are sold separately.
02Is a 5C good for a beginner?
Yes, though many students start on a 7C. The 5C's larger rim gives a fuller sound but takes more embouchure strength to sustain.
03What does Group I mean?
It identifies Bach's cornet mouthpiece series. The playing characteristics come from the 5C size and cup depth, not the group label.
04How does 5C compare to 7C?
The 5C has a wider rim diameter. More lip vibrates, giving a bigger tone and easier low register, at the cost of upper-register endurance.
