This backbore is used with a mouthpiece top that has a #27 throat. You can choose your size option (S, TT, M, ML, MLL, L) and weight after initial selection.

Small - Slightly larger than Schilke A backbore. Produces a compact lead sound with good upper registger 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 mouthpiece 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.