Features: Symphony in F/Bb (reversible) .468" (11.89mm) bore 12" (305mm) standard throat yellow brass bell tapered rotors & bearings lacquer finish 7BW mouthpiece deluxe hardshell case. A Geyer-style horn (change valve following the main valve cluster) the 10D provides control & focus with the flexibility of sound necessary in chamber & symphonic settings. Full warranty.