Detail 01
Large shank
Fits large-bore tenor and bass receivers only. A small-bore horn needs the 'S' models instead.

Independent shopping perspective
Large-shank 4.5AL trombone mouthpiece in gold plate, 25.85mm cup with a barrel backbore. For symphonic tenor players wanting a darker, easier 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
Fits large-bore tenor and bass receivers only. A small-bore horn needs the 'S' models instead.
Detail 02
Sits between the 5AL and 4AL. Slightly more lip inside the rim than a 5, without a 4's demands.
Detail 03
Wide rim spreads pressure over more lip, which helps endurance on long rehearsals and concerts.
Detail 04
Fairly open bore. Moves more air for volume, but takes steadier support than a tight throat.
Detail 05
Straight-walled taper that darkens and centers the sound rather than adding brightness or edge.
Detail 06
Softer feel on the lip than silver. Chosen by players whose skin reacts to silver plate.
Final check

Product questions
Straight answers to the questions shoppers most often ask about this product.
Only if it has a large-shank receiver. Most student tenors are small shank, where this will not seat properly. Denis Wick makes small-shank 'S' versions of similar sizes.
The 4.5AL has a slightly larger cup (25.85mm vs 25.73mm) and a wider rim. The 5AL's deeper cup and larger bore push projection; the 4.5AL blows easier up top.
Tonally the cup and backbore do the work. Gold's advantage is feel and skin tolerance — worth it if silver irritates your lip, otherwise a preference.
It is a tenor size. Bass players generally want the wider rim and larger cup of a 2AL, 1AL or 0AL.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.