Schilke Symphony D6.0 (29.03mm) Silver Plated M6.0 (28.52mm) Silver Plated Bass Trombone Mouthpiece ★Purchased new, only test-played a few times. There are slight insertion marks on the shank from use, but the appearance is almost the same as new. *Will not sell separately. The Symphony series modifies the rim contour, cup shape, throat, and backbore of the traditional standard models. This provides a good balance of breath resistance and ease of airflow, and the clarity of attack is also a major appeal for current players. ★D6.0 While having the same rim diameter as the standard model 60, the extremely large cup shape provides depth and clarity of sound, as well as stability across the entire dynamic range. While maintaining the original rim diameter, the blowing feel is slightly more open than the standard Schilke 60. ★M6.0 The combination of a cup shape similar to the standard model 59 and the rim diameter of the 60 gives the sound brilliance.