In pairs these become amazing bipolar wrap pads. They send the stimulation currents within the circle thus are generally safe for above the waist, and are particularly effective when placed on both shoulderblades.
Sold as pairs (2 pads on 1 sheet).
Sizing note: 25mm=1 inch. That makes these roughly 3.5 x 5s inches.
**All pads can be purchased as single sheets or in packs of 3, 5 or 10 at reduced pricing. Larger quantities also available, just ask!