Corning® 2mL capacity vials with round bottom feature a self-standing design and can be color-coded with inserts. Black graduations and larger marking spots allow for easier filling and sample identification. Manufactured from polypropylene to withstand temperatures to -196°C. Silicone washers offer a secure seal. Vials have a special base design that allows them to be locked into cryogenic rack and tray for single-handed manipulation. Sterilized by gamma radiation and certified nonpyrogenic and DNase/RNase-free. Packaged 50/pack, 500/case.