A ; Heavyweight ; profile trumpet mouthpiece option is available in the following best selling rim sizes only. The additional mass provides a darker focused sound, with more secure slotting and increased projection at louder dynamic levels. 6A4a - Small diameter mouthpiece with shallow ; A ; cup and cushion #4 rim. 13A4a - The shallow ; A ; cup, semi-flat #4 rim and tight ; A ; backbone creates an ideal lead mouthpiece. 13 - Rounder rim provides increased flexibility and quick response. ; C ; cup offers volume for tone. 14A4a - A shallow ; A ; cup, semi-flat #4 rim and tight ; A ; backbone for lead work. 14 - With a standard rim, cup and backbone, the 14 is an excellent choice for all around playing. 15A4a - A larger diameter mouthpiece with our ; A ; cup and tight ; A ; backbone for upper register playing. 15 - An excellent all-around mouthpiece with standard C cup and #3 rim. 16C4 - A standard cup and #4 semi-flat rim for a more traditional feel. 17 - A standard cup and #3 rim, this model is well suited for both classical and jazz styles. 18 - A larger diameter mouthpiece with our standard ; C ; cup and #3 rim. Ideal for symphonic work. 20 - This large diameter is for the robust embouchure and offers a huge volume of sound.