Introducing the Nalge Nunc Serum Vials, designed for optimal storage and transport of your valuable samples. Made from durable PETG, these vials feature a continuous thread for a secure seal, ensuring sterility and preventing contamination. Each vial is sterile and comes in a convenient case of 4, perfect for laboratory settings. With a natural finish, these vials are not only functional but also versatile for various applications. Trust Nalge Nunc for reliable quality in your scientific endeavors!