20mL Vials,Clear In Lab File,PTFE Lined,case/72 EPA storage vials for lab use manufacturerSample Vials,20mL or 0.68oz Clear,24-400 Finish with PTFE Faced Silicone Liner,Type I Borosilie Glass. Septa of 5 mils of PTFE facing 120 mils of silicone is bonded to cap.