Vandoren CM4088 B45 13 Series Profile 88 Bb Clarinet Mouthpiece Universal mouthpiece designed by Bernard Van Doren and appreciated by many musicians and band directors. Tip Opening - 119.5 (1/100mm) Medium Long Facing Works best with Vandoren #2.5-#3.5+ Reeds Profile 88 Beak; Series 13 A=440