Compatible with Blueair Blue Pure 411, 411+ filter and MINI blueair 411+ air purifiers. Filter fibers are naturally antibacterial to ensure all you get is fresh air. 2-in-1 high efficiency filtration powerful H13 class HEPA filter captures particles and allergens in the air, perfect for households with pets, improves asthma and allergies.Particulate filter removes particles over a wide area and in the air, including dust, pet hair, common pollutants and fabric fibers.Activated carbon mesh; The carbon mesh layer traps light household odors, smoke, chemicals and volatile organic compounds (VOCs). Replace it every 6 months for best performance to maintain maximum filtering efficiency. Material: Composite material White color Package contents: 2 x air purifier filters Above content only packaging, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.