Maxton classic Clarinet Vienna ""FRANZ"", Mouthpiece for Viennese Bb Clarinet, Model ""FRANZ"", Flexible, agile, lively and natural sound, Made of plastic, With O-rings, Tip opening: 0.80 mm, Facing length: 35 mm, Diameter: 15.4 mm, Recommended reeds: Peter Leuthner Standard 4 - 5+, Peter Leuthner Professional 5 - 7, Pilgerstorfer Concerto 3 - 4, Pilgerstorfer Sonata 3 - 5, Pilgerstorfer Vienna 3 - 7