These filters come in 10-packs and can be used with most face masks. These are five-layer activated carbon, guaranteed to remove all particles within a few microns.
Application: Anti-dust, Smoke, Pollution, Ash
Dimensions: 4.75" x 3.25"
1.The first layer: high efficient filter cloth filter the dust of micron.
2.The second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.
3.The third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.
4.The fourth layer: activated carbon cloth filter density, smaller material.
5.The fifth layer: spunbond cloth, filter out all kinds of harmful substances.
these are the most comfortable masks I have worn yet.