Detail 01
.660 inch cup diameter
Mid-range for Schilke cornet, so the shallow cup is not paired with a cramped rim. Range without shrinking the setup.

Independent shopping perspective
Silver-plated Schilke 13A4a cornet mouthpiece: shallow A cup, .660-inch diameter, tight backbore. Built for players who spend their time in the upper register.


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
Mid-range for Schilke cornet, so the shallow cup is not paired with a cramped rim. Range without shrinking the setup.
Detail 02
Less cup volume behind the lip. Notes above the staff speak more easily, at the cost of body down low.
Detail 03
Adds resistance behind the throat, giving something to push against up high. The c-backbore versions blow noticeably freer.
Detail 04
Slightly tighter than the 26 used across most of this series, in line with the other A-backbore models.
Detail 05
A wider, flatter contact patch that cushions the lip for endurance, but slurs less freely than a rounded rim.
Detail 06
The standard finish and the cheaper one. Move to gold only if silver plate irritates your lip.
Final check

Product questions
Straight answers to the questions shoppers most often ask about this product.
Only the backbore. Both share the .660-inch cup, shallow A cup and number 4 rim. The 13A4a uses a tight a-backbore for upper-register support; the 13A4's standard c-backbore feels freer.
No. It is a cornet mouthpiece and the shank is cut for a cornet receiver.
Not really. The shallow cup and tight backbore suit lead playing. A developing player is better served by the 13, whose rounder rim and C cup give more tone and flexibility.
It gives up some depth and body down low. That is the trade for easier high notes. If you need both ends equally, look at a C or D cup in the same .660–.665 inch range.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.