Detail 01
Group I size
Bach's large-diameter grouping. More lip inside the rim, which helps low register and volume but tires you faster.
Product detailSKU #1274115059643
BachCornet Mouthpiece Group I 3D
Independent shopping perspective
The Korena take
Bach Group I cornet mouthpiece, 3D. A large-diameter rim with a shallow cup, aimed at experienced cornet players.
Strong match
Who this is for
- Brass band cornet players wanting a brighter top end
- Players with a large embouchure who find 7C rims cramped
- Doublers who already play a Bach 3 on trumpet
Consider the trade-offs
When to look elsewhere
- Beginners — the large rim is demanding on endurance
- Trumpet players; the shank will not fit
- Players chasing a dark, wide orchestral sound
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
D cup
Shallow cup in Bach's lettering. Brighter, more responsive up high, with less depth in the low register.
Detail 03
Cornet shank
Shorter and differently tapered than a trumpet shank. It seats only in a cornet receiver.
Detail 04
3 rim size
Same rim number as a Bach 3 trumpet mouthpiece, so switching between horns feels familiar.
Detail 05
$65 price
Standard Bach replacement pricing. Reasonable for testing a bigger rim without committing to a custom piece.
Final check
Know before you order
- 01Cornet mouthpieces come in short and long shank; confirm which your horn takes
- 02Mouthpiece only — no pouch, cap or brush
- 03Coming from a 7C, expect an adjustment period on endurance
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Can I use this on a trumpet?
No. Cornet shanks are shorter and taper differently. It will not seat properly in a trumpet receiver.
02What does the D mean?
Cup depth. In Bach's system D is on the shallow side, which favors brightness and upper-register response over a dark low end.
03Is a 3D good for a student?
It is a large rim. Most students are better served by a smaller size until their embouchure has built up endurance.
04Short shank or long shank?
Check your cornet's receiver before ordering. American-made cornets commonly take short shank, many British brass band instruments take long shank.
