CryoCLEAR vials, 5.0mL, STERILE, Internal Threads, Attached Screwcap with Silicone Washer, Round Bottom, Self-Standing, Printed Graduations, Writing Space and Barcode, 50/Bag, 10 Bags/Case Globe Scientific's CryoClear? vials are designed for the cryogenic storage and transport of biological specimens at temperatures as low as -196?C. The vials feature an innovative screw cap that is co-molded with a layer of thermoplastic elastomer (TPE). This special process provides the leak-proof benefits of an o-ring, while eliminating the risk of contamination and sample loss associated with the use of separate o-rings. The caps feature a star shaped top cavity that is engineered to work with automatic decapping equipment. Each vial is printed with a unique barcode that may be used for automated data collection, accurate sample inventory or to conceal the sample's identity.