willie's Custom Brass Willie's Trombone Mouthpiece Colin α Series (6V a)

A modern American style mouthpiece made of α material, developed with trombonist Kyoichiro Gun of the Siena Wind Orchestra. Supervisor: Kyoichiro Gun (Siena Wind Orchestra) SP finish, rim diameter 25.40 (mm), throat diameter 6.70 (mm), similar to other companies' sizes: Bach 6-1/2AL