Vandoren B45• Bb Clarinet MouthpieceSame technical characteristics as the B45 with a great blowing ease. Opening 1 100 mm 119. 5 Facing length Medium Long 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 their purpose in terms of best playing position, easiest sound projection, greatest playing comfort, and the most controllable and precise articulation.