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.
Small - Slightly larger than Schilke A backbore. Produces a compact lead sound with good upper register support
TT- Developed for endorsing artist Terry Townson. Intermediate in characteristics between Small and Medium backbore.
Medium - Similar to Warburton 7 or GR #2 backbore.
Medium-Large - Similar to Bach 10 backbore. This is an excellent all round backbore suitable for orchestral playing.
Engstrom 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.
Large - This is our largest backbore, similar to a Bach 24. This produces a broad orchestral sound when paired with the appropriate top.