CELLTREAT Freeze Cryogenic Vials are designed for storing biological material at temperatures as low as -196°C, in the gas phase of liquid nitrogen.CELLTREAT product descriptions are based on the highest graduation mark on the vial. Other brands may name vials based on actual liquid capacity.Self-standing re-sealable bags offer a unique storage solution.External thread cap features integrated leak-proof seal, a long skirt for easy one hand aseptic methods, and a thread design allowing it to be removed or sealed with a mere 1 1/4 turn.Caps have textured ridges to provide gripping when wearing gloves.Contrasting black graduations are large and easy to view.Large white marking area for writing also provides backdrop to enhance black graduations.Self-standing base interlocks with Easy Grip Workstation Rack for easy one-handed opening