The North 75SCP100L Defender multi-purpose cartridge / filter is designed to protect against Organic Vapors, Chlorine, Hydrogen Chloride, Sulfur Dioxide, Hydrogen Sulfide, Hydrogen Fluoride, Chlorine Dioxide, Acid Gas, Ammonia, Methylamine and Formaldehyde with P100 Particulate Filter (99.97% min filter efficiency). Features a low Profile design.2 per pack