Features:1. Non-woven Fabric electrode Pads2. Self Adhesive， Re-usable， Long Life3. Bio-compatible， Dry out Resisting4. Lower Impedance， More uniform current distribution， 5. No hot spots， more stimulation comfort.6. Durable construction: can even pull out from the lead wire without damage.7. unlike others， not plastic8. Specially designed holes， on each pad， to release the generated heat and give more comfort and less irritation.9. Specially selected size 4 x 4 cm， Larger pads had no additional benefits， just more heating/irritation of the skin!Note:Cleanse your skin before using electrode pads for better results.Specification:Material: Silicone + GelSize(1pc): 4 * 4 * 0.2cm / 1.6 * 1.6 * 0.1inWeight(1pc): 8g / 0.3ozPackage Size: 26 * 18 * 0.5cm / 10.2 * 7.1 * 0.2inPackage Weight: 83g / 2.9ozPackage Includes:one set (20pcs) Electrode Pads��WARNINGS/PRECAUTIONS* Check with your doctor before using this product， or any other tens product on the market!* Never use this product if you have a pacemaker or any digital implant.* Check with your doctor first if you have any Epilepsy or Heart problems.* Keep away from Children* Do not attempt to modify the performance of this product.* We do not Guarantee that this device will cure/help your condition.