SIXPAD works with non-stick, super adhesive and highly conductive gel sheets. The gel sheet is a consumable item. Please replace with a new gel sheet in case of the following: 1 month after opening / After 30 uses / When the adhesive surface (gel surface) or adhesive has become dirty, deformed, punctured or when it has become dry. Specifically designed to be used with the SIXPAD Body Fit. Evenly delivers electricity to the body. Low risk for skin irritation. Absorbs and evaporates sweat through its temperature maintenance properties. Size H9.5, W5.7, D0.5cm.