If you have a truMedic Electronic Pulse Massager, or any compatible device, these pads are the genuine replacement pads included in our TENS units. Individually sealed and shipped in a 5 Pack box, these pads are the longest lasting pads available on the market today. Certified latex-free, the pads are bound with soft cloth and are made of solid carbon for maximum charge transfer.**For a limited time, truMedic is including an extra set of 4 electrodes with your purchase. Get 24 Pads for the price of 20!If you have any of the following conditions, please consult with your physician before purchasing or using these electrodes: Acute disease; malignant tumors;infectious disease; pregnancy; any implanted medical devices;heart disease; high fever; abnormal blood pressure; lack of skin sensation or numbness in extremities; fever, any abnormal skin condition; any condition requiring the active supervision of a physician.