Vial Sample S / TW / PTFE Cap 24ml Cs144 DWK Life Sciences (Kimble) Clear glass sample vials Closed-top white urea caps with PTFE-faced white rubber liners, attached Packaged in corrugated trays with partitions Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements