Key: Bb/F/D
Bore: .563"
Rotors: double dependent hand-lapped rotors (offset)
Bell: 9-1/2" gold brass
Mouthpiece: Douglas Yeo Signature Mouthpiece

This model will replace model, YBL-622, and was developed with Douglas Yeo, Bass Trombonist of the Boston Symphony Orchestra, Mr. Yeo plays this horn exclusively and his big passion guided the development of the new horn to meet his strict requirements.