CryoSleeve, polyvinyl chloride Clear plastic sleeve encloses a NALGENE CryoCane for extra security during handling and storage. Direct replacement for cardboard sleeve. Allows quick location of empty spaces in the cane and easy identification of a particular vial or vials without removing the sleeve. Will not become brittle while frozen. . Lenght: 273 mm Length: 10-13/16 inch . . . WARNING! NALGENE Cryogenic vials are for research use only, not for in vitro diagnosis or parenterals. . WARNING! ONLY for use in gas phase of liquid nitrogen. Do not use cryogenic vials for storage in the liquid phase of liquid nitrogen. Such use may cause entrapment of liquefied nitrogen inside the vial and lead to pressure build-up resulting in possible explosion or biohazard release. Use appropriate safety procedures as outlined in the NALGENE Cryopreservation Manual (PDF-file or Lit. No. 10096) when handling and disposing of vials.