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Contact SupplierBest selling disposable air active hand warmer hot fingers  Product description of hand warmer Hand warmers are small (mostly disposable) packets which are held in the hand and produce heat on demand to warm cold hands. They are commonly used in outdoor activities. Other types of warmers are available to provide soothing heat for muscular or joint aches. Depending on the type and the source of heat, hand warmers can last from 30 minutes (recrystallisation) up to 24 hours (platinum catalyst). 1. OEM: Offer 2. Free sample: offer 3. Size: 5.5x9cm, 6.5x9cm,   or according to your requirement 4. Certificate: CE,FDA,ISO9001,MSDS 5. MOQ:10,000 pads   MOQ for OEM service: 30,000 bags, or 2,000 boxes. 6. Active ingredient: Iron powder, vermiculite, active carbon, water, salt Product Structure   Working theory When heating material contact the oxygen in the air, it begin oxygenation, this process will continually give out heat for 6 to 8 hours. This process will begin only after your breaking the vacuum packing. Product ingredients Product features The product is made up of 2 parts: heating material, and the non-woven fabrics bag. Heating material is a mixture made up of iron, activated carbon, mineral salt and water. It is inside the non-woven fabrics bag.  When the mixture meets oxygen in the air, it can give out heat.