Sonic Technology's branded, non-prescription one-size-fits-all conductive socks. Sock Kit contains: 1 Pair Electrotherapy Socks embroidered with Sonic Technology Logo for authenticity, one set of snap lead wires with a standard 2mm female connector. Our socks are made of conductive fabric composed of cotton, nylon and special conductive fibers. Sonic Technology's conductive socks will provide full stimulation of the foot when connected to any Muscle Stimulation or TENS unit and with Sonic Technology's Digital NeuroStim TENS and Tonemaster 2200 EMS. The conductive fabric is woven for even current distribution and maximum comfort and efficiency. The fabric is stretchable for excellent conductivity, compression and support. We recommend that the socks be moistened up to the cuff for best conductivity. When used on a single foot, the sock is attached via the lead-wires with one wire attached to the snap connector on the sock and the other wire attached to a self-adhesive snap electrode, which is then placed on the calve or ankle to complete the circuit. When used as a pair, the lead wires are attached to each sock, without using the self-adhesive snap electrode. Each Sock Kit contains one pair of socks, two snap lead wires ending in 2mm female connectors and 2 self-adhesive snap electrodes. The socks do not work independent of a stimulator unit (not included). Since 1981 Sonic Technology guarantees our products. If you have any problems with product defect please contact us for a replacement.