Survivair® Gas/Vapour Respirator Cartridges• Designed to offer low inhalation resistance for easier breathing and less fatigue • Low profile won't interfere with vision • Sold in pairs.Available in:  Organic vapour cartridge, Organic vapour/acid gas cartridge, Multi-gas cartridge, P100 Organic Vapours, P100 Organic Vapour / Acid Gas, P100 Multi-Gas, and Hard Shell P100 Filters.