Just an excellent mouthpiece for the piccolo trumpet. With its larger throat of 25 and large backbore it’s a good match.

The Kanstul Custom B1E is a rare, discontinued high-performance trumpet mouthpiece top section precision-machined at Kanstul's legacy facility in Anaheim, California.Part of Kanstul's B Series blueprint (which exactingly replicates vintage Vincent Bach configurations), the B1E maps to a No. 1 rim diameter combined with a specialized, shallow "E" cup profile. This unique combination is engineered specifically to facilitate the extreme high register, making it one of the absolute premier choices on the market for soprano or piccolo trumpet playing. Built with standard 3/8-40 threads, it allows players to spin it directly onto standard modular backbores such as Kanstul, Warburton, and Pickett

Made at Kanstul factory and part of the Kanstul Legacy.

KANSTUL QUALITY!!!