Combination Cartridge/Filter, NIOSH Rating Chlorine (CL), Chlorine Dioxide (CD), Hydrogen Chloride (HC), Hydrogen Sulfide (HS), Organic Vapor (OV), P100, Sulfur Dioxide (SD), Magenta, Yellow, Compatible with Brand and Series MSA Comfo Twin-Cartridge Series, Respirator Cartridge Type Air Purifying Respirator, Respirator Connection Type Threaded, Package Quantity 6