The cap of these vials is provided with a seal ring inside to make it completely leakproof. 

Cryo vials are normally used for storage of Biological material, human & animal cells at temperature as low as -190°C. 

These sterilized tubes are provided with white, promient graduations and a long making area for sample identification. 

The longitudinal grooves in the base give a non twisting feature to these vials when places in a cryo rack.

Capacity: 4.5ml, 1.8ml, 1.0ml