Yamaha 11C4 mouthpiece is a precise, easy playing and reliable way to compliment your cornet s sound. The 11C4 mouthpiece combines a medium sized rim diameter with a standard sized cup depth to achieve great playability. The medium size means the 11C4 is an extremely versatile mouthpiece and can allow your cornet to play a wider variety of tones. An ideal choice for students wanting to extend their range, without distancing themselves from familiarity.