Vandoren B40 Bb Clarinet MouthpieceSame facing as the B45 with a wider tip rail, it produces a compact and centered sound. Opening 1 100 mm 119. 5 Facing length Medium Long Instrument This series is available with two different beak versions: Traditional and Profile 88 . The difference between Profile 88 and Traditional mouthpieces is in the exterior angle of the beak. Therefore, the musician is free to choose the model which suits his purpose in terms of best playing position, easiest