These Coders available in different colours can easily fit into the cap of cryo vials for colour identification of different samples.  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 prominent graduations and a long marking area for sample identification. The cap of these vials is provided with a seal ring inside to make it completely leak proof. The longitudinal grooves in the base gives a non-twisting feature to these vials when placed in a cryo rack.