willie's Custom Brass Willie's Trombone Mouthpiece POLARIS Series POLARIS Large Bore Tenor GP Finish (☆)

A symphonic model of European type 6-1/2. With seven different cup depths, it can be used for any playing style. Supervisor: Toshihiro Shirahama (Associate Professor, Kurashiki Sakuyo University) GP finish, rim diameter 25.40 (mm), throat diameter 7.00 (mm), similar to other companies' sizes: back 6-1/2A