Warburton WCC Signature Bill Carmichael trumpet mouthpiece top, a shallow modified V cup, inside Ø .590" (14,95mm), outside Ø 1.090" (27,61mm), silver plated. The WCC Top is designed for the lead trumpet player desiring a big sound in the low register and a full-bodied sound in the upper register that does not thin out. One of the main attributes of this mouthpiece is the cushion rim. This rim is a little larger in width making it easy on your chops. Even though the inner diameter is rather small the mouthpiece does not feel that way at all. The sound in the low register is robust and big and the uppers are easy because the unique cup design