Lovely and Reusable gel Instant hot pack, heat pad Weareprofessionalsuppliersforinstantheat packs,icepacks,softcoldpacks andhot&coldpacksandsomeotherpromotionalgifts. OurproductshaveCE,FDA,SGS,ISO9001,ISO13485andMSDScertificates. QualityofouritemsconformstotheEuropemarket,Americanmarket, Australiamarketandotheroverseasmarket,soplsdon'tworrythatourproducts can'tmeetthestandard..Ifyouneedanycertificate,plsletmeknow. To Activate: - Locate metal disc and bend with fingers until it clicks - After a few seconds, knead gel for optimum performance To recharge: - Put the cooled pack in boiling water. Boil for approx. 5 minutes or until crystals areliquefied and clear - Allow to cool before re-activating - Keep away from the heated surface of pan - Do not put the hand warmer in a microwave oven Contents: sodium acetate, water ( non-toxic