OPS Diagnostics' Cryogenic Vials (1.8 ml) can be used to store any sample, from bacteria to cell lines, at temperatures as low as -196 °C. Vials have external thread, silicone O-ring caps, and frosted labeling area. Vials are sterile, RNase-free, DNase-free, pyrogen-free, and DNA-free. Skirted for easy handling. Case of 300.