Reusable Mask with 2pcs Filter Sheet
These reusable face masks have a hidden pocket that you can add a filter for better protection.
It comes with 2 filter sheets that have PM 2.5 (Particulate Matter) filter element consisting of 5 layers with Activated Carbon layer in the middle.
The filter should be replaced after EVERY 48 HOURS OF USE.
Do note that the mask is washable, unlike the filter.