Multi-Gas/Vapor Smart® Cartridges For 7000/7800/9000 Series Respirators NIOSH Approved For: Organic Vapors, Ammonia, Methylamine, Chlorine, Hydrogen Chloride, Sulfur Dioxide, Chlorine Dioxide, Hydrogen Fluoride, Formaldehyde, and Hydrogen Sulfide Simplifies... Quantity 1-4: $17 per pair Quantity 5-9: $16 per pair Quantity 10+: $15 per pair