This is a custom signature model by Bobby Shew. Please note that it has a Kenyon shank. The size is slightly smaller than a Bach 10-1/2. The rim is semi-flat and the thickness is normal. The cup is a V-cup, deep but slightly narrow. The throat is around #17 (4.39mm). Like the Monette and Eric models, the straight part of the throat is slightly longer, providing particularly stable high notes. The sound is very mellow and has a rich resonance. Transitioning from a trumpet is smooth. Please feel free to ask if you have any questions.