... ,manufactory 2,health product 3,keep body warm 4,alleviate the pain warm pad1. [Characters] heating itself, no need fire. The usage is ... , shoulder, lumbago and knee without anyones help. The pad can keep warm for 12 hours in the temperature of 45. It could ... , Salt, Resin, Vermiculite, Carbon dust. 7. [Shelf life] Three years. warm pad