The CORNING Polypropylene 2mL Self Standing Cryogenic Vials 430659 come in a pack of 50 units. These vials are designed for cryogenic storage and feature a self-standing design for convenient handling. Made of polypropylene, they are suitable for use in physical, dental, medical, microbiological, and biological laboratories. Manufactured in the United States by CORNING, a reputable brand known for high-quality laboratory supplies.