High quality self adhesive silicone rubber electrode with pre-wired pin connector. Pin connector is connected to pin lead (2.0 mm) of T.E.N.S. wire. Electrode size 40 x 40 mm. Can be used repeatedly for several times. When electrodes become less adhesive, wet briefly with cold water, let air dry. And store in closed bag. Pkt of 2 pairs (4 pcs).