The MSA Advantage Multi-Gas & P100 particulate cartridges is NIOSH approved and provides lightweight, low-profile performance. This cartridge protects against organic vapor, chlorine, sulfur dioxide, chlorine dioxide, hydrogen chloride, hydrogen sulfide, ammonia, methylamine, formaldehyde and hydrogen fluoride. It is effective against all particulate aerosols. This cartridge fits the MSA Advantage Series respirator masks (half-mask and full-face styles)Package contains two (2) respirator cartridges. MSA respirator masks sold separately.