Detail 01
.450-inch (11.42mm) bore
This is the B4’s stated medium bore size.

Independent shopping perspective
Schilke’s B4 Traditional Custom Series Bb trumpet combines a .450-inch medium bore with a 5-inch medium-throat bell and #3 taper. It is voiced for a player pursuing brilliance along with efficiency and additional resistance, and is described as playing broader and brighter than the B6. The listed configuration is silver-plated and uses a tunable beryllium bell. Monel valves, a first-valve thumb saddle, and fixed third-valve ring round out the setup, with a Schilke Standard Series mouthpiece and custom double hard case also listed.

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
This is the B4’s stated medium bore size.
Detail 02
Defines the listed bell and taper configuration.
Detail 03
Identifies the bell configuration named in this version’s title.
Detail 04
Monel is the listed valve material.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
It is a Bb trumpet.
The listed bore is .450 inch (11.42mm).
It is described as playing broader and brighter than the B6.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.