Aijiren Tech crimps top headspace vials are available in a flat or round bottom style, with clear or amber glass. Headspace closures are available in pre-assembled caps with septums or can be ordered individually. Pressure release, seal with lining, and seal with magnetic lining is also optional. https://www.labanalyticaltesting.com/6-20ml-20mm-crimp-top-headspace-nd20.html The material of...