hand warmer manufacturer Standar Size: 10x 13 cm CE, ISO, SGS ETC hand warmerIngredients: Iron powder, water, activated carbon, cellulose, salt and catalyst. Non-woven cloth imported from Japan with better stability and duration. Safe, natural ingredients, no odor, no microwave radiation, non-poisonous, non-flammable, harmless and environmental.Portable type(a small and slight piece), facilitate ...