Detail 01
Group II 18
A larger rim diameter with a shallower cup. Easier in the upper register and on endurance, at the cost of some low-end depth.

Independent shopping perspective
A gold-plated Bach cornet mouthpiece in the Group II 18 size — a wider, shallower cup. For cornet players who already know their Bach number.

Strong match
Consider the trade-offs
What matters in use
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 01
A larger rim diameter with a shallower cup. Easier in the upper register and on endurance, at the cost of some low-end depth.
Detail 02
Feels warmer and slightly slicker on the lip than silver. Softer metal, so it wears through faster on heavy use.
Detail 03
Shorter and narrower than a trumpet shank. It will not seat correctly in a trumpet leadpipe.
Detail 04
Bach's core production line, made to the published rim and cup dimensions rather than a custom or reworked design.
Detail 05
Brighter, more focused sound with less resistance. Pedal tones and the low register take more work.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
No. This is a cornet mouthpiece. The shank is shorter and narrower than a trumpet shank and will not seat properly in a trumpet.
Gold feels warmer and slicker on the lip and is a common choice for players who react to silver. Silver is harder and wears more slowly. The sound difference is minor.
The groups are Bach's rim diameter bands. Group II sizes run wider than Group I. Wider rims spread the pressure but demand more control.
Change one variable at a time and give it several weeks. A teacher can tell you whether a rim or cup change actually fixes what you are fighting.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.