Replacement pack of PM2.5 filters with 5 layers of filtration. Keep your filtration level at its optimal by replacing your PM2.5 filter regularly.
Comfortable and Breathable: Made up of a soft cotton material, skin-friendly, breathable, and comfortable to wear.
Additional Protection: The replacement filters provide good and effective protection. Filter Size: Suitable for most adults' face mask with a filter slot. Our filters can protect your mouth and nose from small particles in the air, automobile exhaust and etc.