UNIVERSAL COMPATIBILITY: Our TENS model pads are designed to fit your muscle stimulation machine with pigtail snap connectors sized 1.8 - 2.2 mm REUSABLE: This TENS electrodes pads can be used multiple times for optimal relief from discomfort. Simply use the resealable package to keep your pads fresh and clean Superior Self-adhesive: This premium TENS replacement pads ensures a firm and comfortable attachment to your back, chest, leg, shoulder and arms, knee or sciatic nerve with ease Trusted Quality: This electrodes pads are FDA Cleared OTC with resealable packaging for durability. They are latex-free and non-irritating to ensure users of all skin types have a safe, comfortable experience Use Tips: Ensure your skin is clean and dry before applying the electrode pads. To extend their lifespan, rinse the adhesive gel under cold water, shake off excess water, and let it air dry. Place the sticky side of the electrode on the clear sheet it arrived in and put back in the packaging Flexible and measuring 2” each, they conform to your body and provide large coverage!