Clarified, polypropylene wide-mouth containers allow visualization of specimens and are flexible, crack-resistant and autoclavable Lid is ribbed for easy handling and the clear label lets you view the specimen Pressure-sensitive inner seal (see individual item description if included) protects against leakage and reduces exposure to formalin vapors Containers are filled with 10% buffered formalin Product is labeled with biohazard Non-Latex Shelf Life: 36 months