... hand warmers Supply OEM Reusable hand warmer becomes warm at once. reusable, lovely Certification MSDS, CE, SGS, FDA Metal Hand Warmerpromotion, gift, necessary in winterFeature1) Instant heat ... crystallization, when the crystallization completed, squeeze the hot pack to make it soft and ready to use2 To ... recharge: place the hot pack in boiling water with cloth below, note, prevent ...