The plastic vial caps used are made Send Inquiry Chat Now Vials, 18mm Magnetic Universal Screw Cap & Septa Only, Center Vials, 18mm Magnetic Universal Screw Cap & Septa Only, Center Hole; Silicone/PTFE, Shimadzu Part Number:220-97331-04 Cap and Septa Only, No Vial. Send Inquiry Chat Now Cap & Septa, 13mm PP Screw Cap, Silicone/PTFE, 1000/pk