You are buying 1 case (6 in the case).
This is a lot of 6, 3M FR-57 High Efficiency Cartridges with model number 453-03-02R06 that have expired.
They were stored in a climate controlled environment.
2011 and newer, some boxes were opened to inspect, but all cartridges are still sealed in the original packaging.
These cartridges are used for personal protective equipment such as masks and respirators.
3M brand, known for quality and reliability.
I have 8 lots of 6 available.