willie's Custom Brass Willie's Trombone Mouthpiece Universal Alto Alto SP Finish (7S)

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 SP finish, rim diameter 25.00 (mm), throat diameter 5.80 (mm), similar to other companies' sizes: Bach 6-3/4C