Premium Quality TENS Electrode Pads: improved carbon film, good conductivity, low impedance and uniform current distribution.Medical Grade Reusable Electrodes: bio-compatible, non-irritating, latex-free and superior environmental adaptability of hydro-gel.Excellent Self-Adhesive Performance and Easy to Use: good sticky, quick grab, easy to peel and dry-out resisting; the individually bagged for convenience of storage and use.Universal Compatibility: the Electrode Pads Fit Most TENS/EMS in the Market with Pigtail/PIN type Connector.These are premium self-adhesive and reusable electrode pads that are made with high quality adhesive for reusability. Our 2x4 Inches Electrode Pads are Companion for most TENS units, or Electrical Muscle Stimulation Machines that use the Industry Standard PIN Connector."