Headspace vials, flat top, rounded bottom, pkg of 100 volume 20 mL, clear glass vial, O.D. × H × I.D. 22.5 mm × 75.5 mm × 12.5 mm, long neck; find Supelco-854181-U MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich.