High temperature PTFE/silicone, diam. × thickness 18 mm × 0.060 in., for use with 22mL vial: 27196: Septa, Thermoseal ®, pkg 100 High temperature PTFE/silicone, diam. × thickness 22 mm × 0.100 in., for use with 20, 40, or 60 mL vial: 27197: Headspace vial, clear glass, beveled top, flat bottom