Two sets replacement pads for the silver HomeClinic Twin Channel Tens Machine.
As you can see, or know if you own one, the tens unit comes with two sets of self adhesive pads.
You peel off a plastic cover sheet and they attach, then replace the cover after each treatment
Eventually the sticky face wears off.
A tip is to use a water based gel like KY Jelly or Durex Play (saving over specialist conducive electrode gel) and hold the electrode pads on with surgical tape.
Ultimately though replacement tens machine spare pads will be needed.
Two sets of two pads are supplied.