About 6mL vials1).6ml crimp vials ,22*38mm . 2).suitable metrohm instruments . 1.20mm Headspace Crimp Vials ND20 China Headspace Aluminum Crimp Caps Manufacturers, Suppliers Headspace crimp vials, the value have 6ml,10ml, 20ml clear and aer to choose, the bottom have flat,rounded and rounded-flat,etc. Match with crimp cap for GC analysis.