100 X Membrane Solutions 2ml HPLC Vials 9-425 Autosampler Vials with Write-on Spot and Graduations Type Threaded Vial and 9mm Blue ABS Screw Caps & Septa, Amber 9mm Screw Thread Autosampler Vials are made of clear Type 1, Class A Borosilicate Glass with a writable label for sample identification.