[SIZE] Air purifier replacement filter element (2.56 x 2.56 x 3.74 inches). [FILTER COMPOSITION] Pre-filter layer, HEPA filter layer and activated carbon filter layer. [FUNCTION] Filter helps purify pollen, smoke, pet dander and PM2.5 micrometer air pollution in the air. [REPLACEMENT CYCLE] It is recommended to replace the air purifier filter elements every 3 to 6 months. The filter life depends on the operating time and existing air conditions. Color: White Material: Plastic Package Contents: 2 x Air Purifier Filter 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.