5 Layer PM2.5 Filters for Reusable Antibacterial and Pathogen Face Masks!
The number 5 in PM2.5 refers to the atmospheric particulate matter (PM) that has a diameter of less than 2.5 micrometers, which is about 3% the diameter of a human hair! Blocks 99.997% of air pathogens.
Fast Deliveries to USA: Delivered 5 to 7 days
Safety standard: GB2626-2006
Protection class: KN95
Material: Cotton, polypropylene, magnetic far-infrared polypropylene
Size: Free size
Quantity: 10/20/40 pcs