FEATURES: 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. HOW TO USE: Step1:After washing your hands,take out the product; Step2:place the PM2.5 carbon filter pad in the mouth cover to prevent slipping; Step3:Install thePM2.5 carbon filter,fit your face and wear it correctly. PRODUCT SPECIFICATION: Material : Non-wovenCloth,Melt-blown cloth. Dimension:4.72" x 3.15". Note: 1. When film or sticky sediment stains emerge, please replace the filter. 2.Filter insert can not be cleaned and should be replaced everyday for getting best protection.