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. Available in 2 mL and 5 mL Designed for safe storage and transport of biological materials in extremely low temperatures Crafted from high-quality plastic materials for optimal durability and reliability Features a screw cap and silicone gasket for a secure, leak-resistant closure Self-standing bottoms provide optimal stability Externally threaded to reduce the risk of contamination Features white writing panel for easy labeling and identification Printed, easy-to-read graduation marks allow for precise measurement Does not contain DNase, RNase, DNA, or pyrogens DO NOT USE IN THE LIQUID PHASE OF LIQUID NITROGEN