This listing is for a single (1) vintage Koss M/80 Plus 1" dome tweeter, p/n SP-3T60A.

  Tweeter has been tested with music & a multi meter.It isin very good working condition. 

 DCR = 5.3 (#1) .

 These are stamped 5 ohms but are more like a 6 ohm tweeter.

Face plate measures 2 13/16" by 3 15/16".