Adult PM 2.5 5 Layer Filter for Face Mask

Adult size face mask PM 2.5 filters.  Filters should not be washed or reused. Filters should be replaced frequently. Replacement 5-ply anti pollution pm 2.5 air purifying activated carbon filter 2, 5 or 10 Pack of replacement Filters for use in Face mask filter pockets. These filters will fit most face masks including ours. Approximate size: 3 1/8 in x 4 1/2 in PM 2.5 Filter for Masks, Face Mask Filter, Filter for Face Mask, Mask Filter, PM 2.5, HEPA FILTER for MASK