Gleichweit Bb- Clarinet JG4 - W, Mouthpiece for Bb Clarinet, Viennese cut, Johannes Gleichweit model, Viennese bore (15.4 mm), Facing length: 30 mm, Tip opening: 0,86 mm, For wooden reeds, Recommended reeds: Leuthner Standard and Professional (Viennese cut) and Pilgerstorfer Concerto, Vienna, Morré ""Pi