411 Filters Fit Models: 411 Combination Carbon Particle Replacement Filter Compatible with Blue Pure 411, 411, MINI and 411 Auto Air Purifiers. High Quality Air: The particle filter can absorb airborne particles such as pet dander and dirt from your indoor environment, providing a better air environment. 411 Filter Premium: The HEPA filter captures 99.97% of airborne particles as small as 0.3 microns. Usage: It is recommended to replace the filters every 6 months. To keep your air purifier working properly. Fresh air comes from timely filter replacement. Material: Plastic Color: White Package Contents: 4 x Air Purifier Filter 1 x Cleaning Brush Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.