Polycarbonate freezer storage boxes outlast cardboard and are less expensive than stainless steel. Clear lids and boldly numbered cells simplify sample viewing and identification. Holds most cryogenic vials up to 2.0 mL; vented for rapid pressure equalization. Temperature range: -196°C to +120°C (autoclaving not recommended); use in mechanical freezers or liquid nitrogen. Five assorted color boxes per pack.