I am looking to purchase a large Yamaha cornet mouthpiece,size 16 or 17 with a fairly deep cup. Willing to buy or exchange. got a few cornet and flugel mouthpieces that i no longer need. Not that familiar with the sizing on the yamaha range. I've Tried a David King signature mouthpiece that a friend had,would also consider that. I believe that they come with the new Xeno cornets. Hope someone can help.