Tissue specimens have particular requirements for cryogenic storage. The CryoELITE Tissue Vial offers researchers who work with tissue samples ease of use, convenience and security. They are manufactured from low binding, cryogenic-grade virgin polypropylene that meets the USP Class VI classification and certified to be free of pyrogens, RNase / DNase and endotoxins, with a storage temperature range of -196°C to +121°C. The externally threaded cap provides a seal that exceeds DOT and IATA classifications for diagnostic specimens and are capable of maintaining asecure closure during freeze/thaw procedures during transport. They have a flat bottom and a stippled external surface to promote easier handling. Sterile.