We handle the body warmer with 1. Specifications and Capability index: (1) Mini style: Weight is about 30g, continual warm period: =8 hours, Average temperature: 52 centigrade, Maximum temperature: 71 centigrade, (2) Economic style: Weight is about 60g, continual warm period: =12 hours, Average temperature: 52 centigrade, Maximum temperature: 71 centigrade 2. Ingredients: Iron powder, Wooden powder, Active carbon, Salt, Water, Vermiculites. 3. Using method: Open the outside bag, and take out the inside bag, then put it in clothes. 4. Remarks: (1) This body warmer is innocuity, no burning risk, but can not be eaten. (2) Do not touch skin directly, when use it for warm. (3) Warning: When the body warmer touch body for a long time, low temperature scald with indolence feel maybe will be brought. Please pay attention to use this body warmer for the people whose skin is not so good, or who can not take care of himself. Please don't hesitate to contact me for more further informations.