OEM Jupiter, Sousaphone, Tuba, Top Valve Cap lacquer, 1 each.  Not for JCB-584.  Fits JCB-382 & -384, JSH-596 & -696, JSP-1000 series.  Contact me with your model number if you wish to confirm.  See my eBay item number: 277346728993 for this top cap in silver.