6 pack, p95 particulate filters, for workplace/occupational applications only, provides at least 95 percent filtration efficiency against solids & liquid aerosols & is strongly resistant to oils, used for paint spraying, solvents & pesticides, great choice in respiratory protection for the professional, for use with 3m 501 filter retainer on #5000 & #6000 series cartridges only, for use with tv #218-111.