Features: Suitable for various medium frequency electronic physiotherapy machine. Help to improve blood circulation, promote metabolism and eliminate fatigue. Self adhesive, high adhesive, convenient to use and reusable. Useful and safe accessory for medical care. Material: Non-woven+ Gel. Size(1pc): 3cm in diameter. Connection plug size: 2mm. Package include: 10/20/50/100pcs electrode pads. Note: Cleanse your skin before using electrode pads for better results. In pacemaker carriers, serious heart rhythm problems, suffering from epilepsy patients is strongly discouraged from using an electrical stimulation device. Furthermore, the electrodes should not be applied to open wounds or diseased skin. It is also advised not to use the electrodes in the region of the carotid artery, just above the heart, the larynx and larger metal implants.