Quality American Made Electrodes. Manufactured with High Quality Medical Grade Materials. Dual Layer, Thick Hydro Gel for Maximum Uses. Great Dispersion for Patient Comfort and Best Treatment Results. Very Low Impedance Means Longer Battery Life. Lead Wires Made With Fine Copper Strands and Molded Connectors for Flexibility, High Conductivity and Secure Connections to TENS and E-Stim Units.