Electrodes, TENS, Misc. - Spectra 360 electrode gel, 250gm (8.5oz) tube - each : Spectra 360 electrode gel has non-gritty STAY-WET formula allows for prolonged use without re-application. User for ECG, TENS, monitoring and pediatrics. The gel is salt and chloride-free, it is non-irritating, hypoallergenic and bacteriostatic.