willie's Custom Brass Willie's Trombone Mouthpiece Universal Alto Alto GP Finish (6S)

An alto model created in response to the request of Peter Kellner. Fully utilizes the potential of the Thyne Universal alto trombone. Supervisor: Peter Kellner GP finish, rim diameter 25.40 (mm), throat diameter 5.80 (mm), similar to other companies' sizes: Bach 6-1/2C