Yamaha OEM Silver or Lacquer Pearl Valve Finger Button, 1 each. Tuba (YBB-321, YEB-321), Sousaphones (YSH-301, YSH-411). AKA Finger button. Yamaha P/N H1641001 (lacquer w/pearl), H1841001 (Silver w/pearl). Contact me if you wish to verify your model's fit or you need other parts.
