4 Valve Model The AC156 Professionel Series features a 413-inch bore with a four valve design with a direct air column through the valveblock for less resistance. The AC156 Series also features a 6.6-inch Rose brass bell designed for a dark sound with outstanding response and a 1st valve slide trigger for easy intonation adjustment.

Product Features

  • Key of Bb
  • .413″ bore
  • 6.6″ Rose brass bell
  • Monel valves Vertical valve slides with 1st valve slide trigger Direct air column design through valveblock
  • Includes case and mouthpiece