Holds 3M's 5N11 and 5P71 filters (Item # href='/products/n95-particulate-filters-pkg-of-10'>38030 and href='/products/3m-p95-pre-filters'>5P71, both sold separately) in place on top of their 6000 Series cartridges (Item # href='/products/organic-vapor-cartridges-pair'>10865, sold separately).

Sold as a pair.