Corning® Internal Threaded Polypropylene Cryogenic Vial manufactured by Corning can withstand temperatures down to -196°C. The vial features black graduations and large marking spot as well as a silicone washer for a secure seal. Corning® Internal Threaded Polypropylene Cryogenic Vial is available with round bottom and self-standing bottom. The self-standing type is designed with a special base which allows the vial to be locked into cryogenic rack and tray for single-handed manipulation.