9-425 Screw Vials - 2ml Hplc Vials with unique thread design ensures consistent seal and can be reused, not volatile, easy to use, Clear vial with large writing patch for sample identification and it with ISO 9001 certificated. PTFE / Silicone Septa - 2ml Clear autosampler vial included blue ABS Screw Cap & Septa (White PTFE / Red Silicone Liner).