knob for Sony DSR-1800 DVcam.  Probably fits other, similar sony products, but I've no way to know for sure.  Sorry, no returns.  Price is for 1 knob.  Free shipping after the 1st if buying more than one.  

4 red knobs available (audio input)
1 white knob (phone level)

Knobs seem interchangeable, but the above info show the location on my unit.
 
Please message me right after purchase which you want.  I'll update listing as they sell.  

Last pic shows item these were removed from.