Set contains 2 Cryo Stims and conductive gel. Stims are stored in freezer. The aluminum probe end is used to apply cold therapy to a small region. Padded foam handle protects your hands from the cold. The conductive gel contains pure aloe vera, enriched with vitamins A, D, and E. It's a cool and soothing skin moisturizer that enhances conductivity of Cryo Stim Probe. Non-staining, non-greasy, hypo-allergenic, non-irritating and water soluable.