These single use grounding plates have a conductive adhesive gel in two separate cells to provide neutral reference during electrosurgical procedures.
The pads have been discontinued by GIMA and are no longer available for sale. The compatible alternative is 30495: https://www.truesurgical.co.uk/webshop/electrosurgery/gima-30495-rem-electrosurgery-patient-pads-pack-100/