Based on the Schilke standard trombone mouthpiece models, the Symphony Series have modified rim contours, cup shapes, throats and backbores creating a responsive balance in resistance and blowing freedom along with attack clarity that will appeal to the contemporary trombonist. The Symphony D Series offers a deeper bottom to the sound core. Schilke Symphony Series mouthpieces continue a tradition in outstanding Schilke workmanship combining old world craftsmanship with the demands of the modern brass player.