1. When should replace it?: Obviously feel the conduction performance decreased,cause decreased strength.
2. When it loses it’s adhesiveness, the adhesive surface (gel) dries out or is gouged or dirt/grime that cannot be removed exists.
3. How long can the gel sheets last?: About 30 times, if you use and maintain them it the right way.
4. How to maintain them in a right way?: Clean/dry your skin before using; Stick them back to the cardboard after using.
14pcs gel sheets (7 packs gel sheets).