This is a set of two 1.7 oz Ziip Electric Complex Conductive Gels for use with microcurrent / nanocurrent devices. When I buy my Ziip Halo devices I don't use the gel that comes with them, so these gels are new and un-used and still in the inserts that came with my devices (see photos.) I use a different brand of gel with my Ziip Halo, so I never need to use these. Here's the info from the Ziip website: "Electric Complex Gel – a gentle but powerful ZIIP nanocurrent™ and microcurrent conductive gel suitable for daily use on all skin types. The Electric Complex Gel has a unique, highly conductive formulation, which allows the Dual Waveforms to pass effectively through the skin. The lightweight formulation lasts the duration of all ZIIP treatments while having a refreshing feel on the skin." (These sell for $25 a piece online so the set is technically worth $50.)