Ice&Heater Bag
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can get warm in cold day,it is on side to human body.
Directions
1.Break off the iron sheet with your hands,The crystal discharged heat while rubbing it several times,when the cristal be comes cool and gets stiff,take it out and wrap it with towel,boil it with water in a pot for about 10 minutes.
2.When the liquid is cool,take it out break off the iron sheet again.