The Nalge Nunc SYSTEM 100 Cryogenic Vials (NALGENE 5000-1020) are designed for the safe storage of biological samples at ultra-low temperatures. These vials feature a secure, leak-proof seal to prevent contamination and ensure sample integrity. Made from durable polypropylene, they withstand extreme conditions without cracking or breaking. Each vial is clearly labeled for easy identification and comes with a unique locking mechanism to prevent accidental opening. Ideal for laboratories, these vials are perfect for cryopreservation, making them a reliable choice for researchers and scientists alike.