Detail 01
.690 in (17.52 mm) cup diameter
Large side of medium. The rim's high point sits near the center, so it plays smaller than the number suggests.

Independent shopping perspective
Silver-plated Schilke cornet mouthpiece, .690-inch cup with a 26 throat. Larger Group II diameter for players who want a rich, brilliant tone with room to breathe.

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
Large side of medium. The rim's high point sits near the center, so it plays smaller than the number suggests.
Detail 02
Rounder profile rather than a flat cushion. More flexibility and quicker response, but less shelf to lean on.
Detail 03
Standard bore across most of Group II, so resistance stays familiar if you try a neighboring size.
Detail 04
Bright edge over a full core — carries through an ensemble rather than sitting underneath it.
Detail 05
Schilke's larger range, .674 to .720 inch. The 18 sits mid-pack, leaving room to move either direction.
Detail 06
Standard finish. Wipe dry after playing; tarnish is surface-level and comes off with polish, not scrubbing.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
.690 inch (17.52 mm) cup diameter with a 26 throat, in Schilke's larger Group II range.
It measures .690 inch, but the high point sits near the center so it feels smaller than it is. Coming from the .677 model 16, the step up is small.
The 18B4 keeps the same diameter but uses a medium-shallow cup and semi-flat number 4 rim — more resistance and comfort up top. The 18 is the standard all-around version.
No. Cornet mouthpieces use a different shank than trumpet. Schilke lists its trumpet models separately.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.