14a4 Mouthpiece Schilke Silverplated Trumpet Mouthpiece 12 Long & McQuade Schilke 13a4a Large C refers to the CUP VOLUME A., Small Cup B., Mediumsmall C. Its shallow-depth cup and semi-flat rim contour are perfect in lead and solo playing situations, producing a clean-cutting brightness with lush overtones and a comfortable mouthfeel that greatly supports upper-register playing Example9C3c (trumpet mouthpiece)9 refers to the CUP DIAMETER Smallest numbers have smallest diameters C E. Further explanation of the Schilke numbering system can be found below. Schilke MouthpieceSchilke Mouthpiece Numbering SystemsThe Schilke method of mouthpiece labeling has been designed to assist the student, teacher, amateur and professional in selecting a mouthpiece to meet the needs of the player. and backbores unless shown otherwise on the mouthpieces. STANDARD SERIES TRUMPET MOUTHPIECE - SILVER PLATE. Size: 13A4; 16.76mm; Throat: 27; Same as the 13A4a but with the standard c backbore which allows a... Bertrand's Music Online Rentals - Schilke Trumpet Mouthpiece Using this method it is possible for the player to know the characteristics of any mouthpiece.