Vandoren has developed the 13 series mouthpiece specifically for American clarinetists using A440 pitch.Four models have been originally developed with specific facings to this series: the M13, M13 Lyre, M15 and M30 mouthpieces.The 13 series range also encompasses other models (traditional facings): 5RV, 5RV Lyre, B45, B40, B40 Lyre and M30 Lyre.The 5RV Lyre with a larger tip opening and a longer facing guarantees flexibility and roundness.This mouthpiece has an exceptional quality of sound.Tip opening 1 / 100 mm: 113.5Facing length: Long.