1.With CE,ISO,SGS certification 2.The highest temp:68.C 3.Heat duration time: 8;18hs 4.Hand warmer hot pack hand warmer hot pack Warm, soothing relief for muscle and arthritis aches and pains Air-activated, non-adhesive Safe,odorless,micro-thin,easy-to-use,environmentally safe Average temperature is 55°C over 12 hours of natural therapeutic heatMain Component:Iron powder, water, activated carbon, ...