Osmun Trumpet Backbore

Our backbores are designed to fit all cups with Warburton Style threads. They are designed for use in a multitude of different musical settings. Made-to-order.

#1: Very tight, for extreme upper-register work.

#2: Tight, for lead work. This backbore has a bit more volume than the #1 for the lead player who prefers slightly less resistance in the upper register.

#10: Our most popular backbore for Bb trumpet. Offers moderate resistance without sacrificing tone. Applicable to a wide array of musical situations.

#7: Schmid style. This backbore is an alternative classical design which provides an overall different feel from our #10 and #24.

#24: The classic "Orchestral" backbore. Most popular for C trumpet. Often paired with a #24 or #25 throat.

#117: Very open. Widely favored for piccolo trumpet.