willie's Custom Brass Willie's Trombone Mouthpiece POLARIS Series POLARIS Thick Bass GP Finish (1-3/4G)

European type mouthpiece. More detailed sound. Supervisor: Toshihiro Shirahama (Associate Professor, Kurashiki Sakuyo University) GP finish, rim diameter 26.88 (mm), throat diameter 7.00 (mm), similar to other companies' sizes: back 1-3/4G