The material of Headspace Vials is low extractable Borosilicate glass with low expansion rate, high-temperature resistance, high strength, high hardness, Kinesis Headspace Vial, Glass, 18 mm, Precision Thread Screw . Buy Kinesis Headspace Vial, Glass, 18 mm, Precision Thread Screw Neck, Round Bottom, 10 mL; 1000/pk and more from our