Honeywell North Box of 18 Pairs (36 TOTAL) of Acid Gas Cartridges. Cartridge (Packs of 2). Combination filter cartridges feature a low profile with curved top that will not catch on pipes or other objects. Easy to perform user seal checks: even on the gas and vapor cartridges. Full offering, from organic vapors to multi-contaminant. Approved for use with Honeywell North Half Masks: 7700 Series, 5500 Series, RU8500 Series and RU8800 Series. Approved for use with Honeywell North Full Facepeices: 5400 Series, RU6500 Series and 7600 Series. Open package for inspection & photos only. Please review photos, comes as shown. 155 Center Ct, Venice, FL 34285.