The Traditional 5RV Lyre is part of the industry-standard clarinet-mouthpiece range from Vandoren, and has a traditional beak design.
The difference between Traditional and Profile 88 mouthpieces is in the exterior angle of the beak. The musician is free to choose the model which suits his or her purpose in terms of best playing position, easiest sound projection, greatest playing comfort, and the most controllable and precise articulation.
The 5RV Lyre is more open than the 5RV and its facing length is longer. It has a 109 + (1/100 mm) tip opening and a medium facing length.