Gleichweit Bb- Clarinet B11-7 - DW, Mouthpiece for Bb Clarinet, For French reeds, German wide bore (15 mm), Facing length: 28 mm, Tip opening: 1.34 mm, For wooden and plastic reeds, Recommended reeds: D'Addario, Legere European Cut, Leuthner french, Pilgerstorfer french, Vandoren V12