Reusable heat pack
With different color and shape, reusable portable warmly heat pack, which requires no artificial heat source, can be used for gifts and promotion. Do not need to put into the microwave oven; it’s much more convenient than gel pack. Just fold the metal sheet inside the heat pack and then it will start crystallization. When the crystallization is completed, it’s ready to use. To recharge, place the heat pack in boiling water with cloth. Heat it for 10 minutes until the crystal is dissolved. The small size heat pack can warm hand when in outdoor in winter. The printing on it can make product more interesting and funny.