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MATERIALS : Made of high borosilicate glass ,vials with thickness glass,can withstand high temperature and pressure STERILIZED VIALS : The sample vials are produced in a sterile environment ensuring clean and sterilized UPGRADED PACKAGE : Each pack includes 20 pcs vial, meet your expermental needs with ample supply LEAK-PROOF : The empty bottle is expertly sealed with equipment,the rubber stopper and aluminum-plastic cap create a tight,leak proof seal SAFETY : Designed with burr-free aluminum-plastic covers,user are not sharping metal edges during handing and use