1.Five layers of PM2.5 Carbon filtering,Made of activated carbon and non-woven melt-blown filter cloth,effectively keep away from PM2.5 and a range of airborne contaminants.
2.Carbon filters size measures approx. 4.72 x 3.15inches, compatible with most dust cover, easy to insert or replace the original one.
3. Mouth cover filter anti airborne particles dust, seasonal allergies,pollution, ash, gardening pollen and so on, suitable for most occasions.
