Detail 01
28.52mm (1.123") cup diameter
Wide enough that lip placement changes. Expect a break-in period where endurance drops before it comes back.

Independent shopping perspective
Schilke 59 in gold plate — a 28.52mm bass trombone mouthpiece for the full-time bass player who needs low register without losing the top.

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
Wide enough that lip placement changes. Expect a break-in period where endurance drops before it comes back.
Detail 02
A large throat that moves a lot of air. Rewards a strong air stream and can feel unresponsive to a weaker one.
Detail 03
Fits large-bore tenor and bass trombone receivers. It will not seat in a small or medium shank horn.
Detail 04
Softer, warmer feel on the lip than silver. Some players find it grips slightly more. An option if silver irritates your skin.
Detail 05
Schilke's baseline blank and rim contour rather than a signature or custom cut. Numbering runs 44 through 60 by diameter.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Only if it is a large-shank tenor, and even then the 28.52mm diameter is a bass size. Tenor players should look at the 47 through 51 range.
The 58 is 27.68mm and is aimed at players who double tenor and bass. The 59 is nearly a millimeter wider and built for full-time bass playing.
It is a feel and skin question, not a tone question. Gold is smoother and warmer on the lip and is the usual answer for players with silver sensitivity.
Yes. The wide diameter and 19/64 throat demand developed air and embouchure. A student on bass trombone is better served lower in the range.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.