The 3M 6003 Organic Vapor / Acid Gas Cartridge is NIOSH approved against certain organic vapors or acid gas. Use with 3M™ Half and Full Facepieces 6000 Series and 3M™ Half and Full Facepieces 7000 Series with bayonet style cartridge holders. Package contains (2) respirator cartridges. 3M respirator masks sold separately.