The opinion of the Vandoren experts More open than the 5RV with a longer facing. > Explanation of the mouthpiece's structure and its opening Opening 1/100 mm 109.1 Facing length Medium Instrument Bb clarinet Series Traditional clarinet mouthpieces Code CM4028 (Single Mouthpiece) 13 Series with Profile 88 beak
More open than the 5RV with a longer facing.