Borosilicate glass vials meet EPA guidelines for contamination-free containers. Choose between 20-, 40-, and 60-mL capacities. Select standard screw-top or open-top septa caps. Screw-top caps feature either PTFE or septa liner. Amber vials with 2 caps for each vial: open-top caps with 0.125" septa and closed top caps with PTFE liner.