OEM Jupiter Sousaphone mouthpipe tuning bit, with screw.  Lacquered, 1 each.  JSH-590/594/596/696, JSP1000/1010/1100/1109/1110.  Doesn't fit a 1913 Helicon, this is a Jupiter part. Contact me if you wish to verify your model's fit or you need parts for another horn.