With a medium facing and 109.1 tip opening, the Vandoren 5RV Lyre mouthpiece is one of the most responsive and stable mouthpieces on the market today. It is used widely by students and professional clarinetists alike.  Available in tradional and "Profile 88" versions.
 
The difference between the  “Profile 88” and Traditional mouthpieces is in the exterior angle of the beak. The "Profile 88" has a slimmer profile while maintining the same interior chamber demensions. Therefore, the musician is free to choose the model which suits his purpose in terms of best playing position, easiest sound projection, greatest playing comfort, and the most controllable and precise articulation.