2 mL capacity with round bottomSelf-standing designBlack graduations and larger marking spots for easier filling and sample identificationManufactured from polypropylene to withstand temperatures to -196°CSilicone washer for a secure sealVials may be color coded with inserts (see Cat. No. 430499)Special base design allows vials to be locked into cryogenic rack and tray (Cat. No. 430525 or 431131) for single-handed manipulationSterilized by gamma radiationNonpyrogenic and DNase/RNase-free