Yamaha Mouthpiece Trumpet 9C4

I bought this moutpiece some months ago and i like it very much. Now also many of my students started using it, after they have tried it. This mouthpiece is not very known, compared to bigger sizes (like 11, 13, 14, 15, 16) but it's a very easy mouthpiece to play. The particular shape of the rim gives a great grip to the lips, and the cup sounds like biggest mouthpieces. The combination works very well. I like it for all around playing, from classical to jazz.