Detail 01
.643 inch cup diameter
On the narrow side. Less lip vibrates inside the cup, which helps high notes but caps how much low end you can move.

Independent shopping perspective
Schilke's 10B4 trumpet mouthpiece in gold plate: a narrow .643-inch cup with a medium-small funnel B cup, for players who want upper-register support and still keep body in the sound.


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
On the narrow side. Less lip vibrates inside the cup, which helps high notes but caps how much low end you can move.
Detail 02
Shallower than a C, deeper than an A. Keeps warmth in the tone while making the top of the staff less work.
Detail 03
Throat gauge runs backward — 26 is a slightly larger opening than 27, so this blows freer than the tight a-backbore models.
Detail 04
Cup depths run A shallow through D deep at matching diameters, so you can change depth later without relearning the rim.
Detail 05
Same rim shape as the silver version. Feels slicker on the lips, and it is the usual pick if silver plating irritates your skin.
Final check

Product questions
Straight answers to the questions shoppers most often ask about this product.
Not a dedicated one. The B cup is medium-small rather than shallow, so it supports the upper register while keeping fuller tone. The 10A4a is the shallower, tighter-backbore lead option at the same rim size.
Rim, cup, and backbore are identical. Gold feels slightly slicker under the lips and is the common choice for players whose skin reacts to silver.
Yes, if the horn takes a standard trumpet mouthpiece receiver, which nearly all B-flat and C trumpets do.
Same .647-ish rim family. The A4 has a shallow cup and 27 throat for high work; the B4's deeper funnel cup gives more tone and a freer 26 throat.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.