Glass Vials 5 Ml found in: 5mm x 29mm Clear Glass Insert, pulled point with bottom spring. Usable Volume 150µl, Vial 5 ml, Vacules w / Screw Caps 5ml,.. these vials are assembled with the following materials: Type 1 borosilicate glass, PTFE/silicone septa, and a polypropylene cap. PTFE/silicone septa, and a polypropylene cap.