Product Overview
Wedge two part backbores consist of an upper section, which can be regular or heavy weight, and a lower shank that can be of different lengths to adjust the gap, or for improving the pitch on a C trumpet. The two part systems provided great versatility in adjusting the backbore to your specific needs.
ML-L - This is the signature backbore developed for Howard Engstrom of the Calgary Symphony Orchestra. It is intermediate between the ML and L backbore.
THROAT - #27
