Vials, open-top screw cap, 2 mL large opening with closures, unassembled convenience packs volume 2 mL, amber glass vial, thread for 10-425, black polypropylene cap, PTFE/silicone/PTFE septa; find Supelco-29121U MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich