keep warmer hot pack Standar size: 10x 13.3 cm or 10 x7 cm CE, ISO, SGS, MSGS etc keep warmer Hot pack, instant hot pack Ingredients: Iron powder, water, activated carbon, cellulose, salt and catalyst. Outer package instruction:Non-woven cloth imported from Japan with better stability and duration. Safe, natural ingredients, no odor, no microwave radiation, non-poisonous, non-flammable, harmless ...