Item Type: Air Filter Element_x000D_ Material: ABS and filter paper 1APPLICABLE SCENARIO: Filter, high efficiency activated carbon and fine pre filter design can work together to reduce airborne particles and harmful odors in living spaces, thereby improving air quality, ideal for pet owners, smokers and city dwellers 2MAINTAIN EFFICIENCY: In order to maintain the high performance of the air filter, it is recommended to replace the filter element every 3?6 months, depending on your frequency of use 3ENVIRONMENTALLY FRIENDLY MATERIAL: Air filter element is made of ABS and filter paper, which is environmentally friendly 42PCS IN TOTAL: The package contain a total of 2pcs air filter cartridge, enough for you to replace and use, very convenient 5FUNCTIONS AND EFFECTS: Air filter replacement can remove most of particles, allow you stay away from pollutionOnly solar air filters compatible, other filters not compatible.2 x Air Filter Element