These vials have a conical interior bottom for maximum retrieval of contents by syringe or micropipette. Can be used for small-scale reactions, centrifugation, storage and shipping. Manufactured from low extractable borosilicate glass. Contents are magnified for easier withdrawal. Solid-top caps have a PTFE resin-faced rubber liner. Open-top caps have PTFE resin-faced rubber septum. All components are autoclavable. Low particulate packaging.