With the electrode contact gel, you can enhance the conductivity of used TENS-EMS electrodes. The contact gel is skin-friendly and odorless, and its gel-like consistency is ideal for use with electrostimulation electrodes for muscle or nerve stimulation, as well as for EEG and EKG. The electrode gel is sold in a 8.9oz tube, allowing for convenient portioning for EMS and TENS applications, with enough quantity for numerous uses. Improving the conductivity of TENS-EMS electrode pads can enhance the overall experience of using TENS and EMS units, making it ideal as an accessory for nerve and muscle stimulation devices or when purchasing electrode pads. The electrode gel leaves no stains, and is non-greasy. Storage: Store in a cool dry place without direct sunlight. Caution: If you experience adverse reaction, or a rash that does no go away after use, discontinue use and contact your supplier or consult a doctor.