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Balego’s TENS Unit 2″ Square Electrode Replacement Pads provide easy plug-and-play installation to keep your TENS unit running smoothly. These reusable pads are backed with a thick layer of non-irritating gel that adheres well to your skin, but leave no sticky residue when removed. The pads are made out of a medical non-woven material that is flexible around joints like the knee, ankle and elbow. The flexible, self-adhesive, conductive pads require no gels or creams to be applied and are FDA-approved.