Aijiren Tech crimp top headspace vials are available in a flat or round bottom style, with clear or amber glass. Part No. Description. VH2017. 20ml clear crimp-top headspace vial, flat bottom, 22.5*75mm, 7.0 type. VHR2017. 20ml clear crimp-top headspace vial, round bottom, 22.8*75mm, 7.0 type. VHR2017-1. 20ml clear crimp-top headspace vial