PRODUCT NAME: 12PCS Organic Vapor Cartridge Set How often should the filter cartridge be replaced? It depends on the chemicals and/or particles you breathe. We recommend replacing the filter cotton every 12 hours of work and the filter box every 30 days of work. Filters are suitable for 6001cn, 5n11, 6100, 6200, 7502, 6800 face cover Organic Vapor Cartridge Set Features: 1. Trapezoidal filter box, high content of activated carbon, long life and good adsorption effect 2. The unique filter circuit design makes the filter element have a longer life 3. Trapezoidal design, the center of gravity swings back, not easy to cause neck fatigue 4. It must be installed above the main body of the face cover to use. After wearing a face cover, the smell is no longer peculiar smell, but fresh air! 5. Double Protection: The professional half mask uses a double filter system to effectively block 97% of organic vapors/gases, smoke, pollen, dust and other particles in the air. The ideal protection device for your work 6. Wide range of application: The filter box can block a variety of harmful substances, chemicals, glass, metal, paint, agriculture, formaldehyde and other irritating vapors/gases in the work area. Prevents dust particles from mechanical work such as welding, sawing, sanding, graffiti, etc. Product Package: 2 * Organic Vapor Cartridge 8 * Filter Cotton 2 * Filter Box Cover