50pcs PM2.5 Activated Carbon Filters Replaceable Anti Haze Filter Paper for Adult

note: ?1) Due to different manual measurement methods, please allow a slight difference in size. ?2) Due to monitor reflections, the color may differ slightly from the actual project compared to the image. ?3) If you have any questions, please leave us a message and we will keep in touch with you. Tip: The frequency of changes depends on how long you use each day. If you use it for a long time a day, it is recommended that you change it once a day to maintain health. If you use it occasionally, you can change it every 3 days or once a week. PM2.5 Activated Carbon Filters Replaceable Anti Haze Filter Paper for Adult(50pcs) 1. The first layer of spunbond cloth filters out micron-level dust; 2. The second layer filters industrial pollutants, automobile exhaust, second-hand smoke and pollen allergens. 3. The third layer of activated carbon cloth filters out micron-level dust; 4. The fourth layer provides filter density for smaller materials. 5. The fifth layer of spunbond cloth filters out various harmful substances.