The DAddario Graftonite Bb Clarinet A3 mouthpiece produces the largest darkest sound in the Graftonite series. This mouthpiece incorporates revolutionary materials to allow ease of tone production. Each Graftonite mouthpiece is made from durable polycarbonate material and is pitched at A=440. This mouthpiece has a tip opening of 0.045 and is ideal for the advancing student trying to find that powerful dark sound.