It is very convenient to use hand warmer outdoors, such as hiking. It's no need to pre-heat. Bring you warm in the cold weather. It can be made into various shape with different logo to meet your special need. It is good choice as gifts and promotional items with cheap price.
Fold the metal disc inside the pack, it will start crystallization. When the crystallization is completed, it is ready for hot use. To recharge, please place hand warmer in boiling water with cloth. Prevent the pack from contacting the bottom of the pot. Heat it about 5 minutes or until the crystal is dissolved. It is reusable.