Dynarex LabChoice Cryogenic Tubes are designed to safely store and transport biological materials in freezing temperatures. These durable plastic Tubes feature a self-standing design for optimal stability and convenient storage. The externally-threaded Tubes are equipped with a screw cap with silicone gasket for a secure seal. Dynarex Cryogenic Tubes feature a white writing panel for easy labeling and clear graduation marks for accurate measurement.   50 PER PACK, 10 PACKS PER BOX, 4 BOXES PER CASE