Features15-ply active carbon filter isolate most non-toxic dust,pollen,fumes,common airborne irritants and other non oil basedparticles. 2Suits for installing in general double air breathing valve activated carbon dust mask.(valve diameter:2.2cm/0.9in) 3Easy to replaced by yourself for your mouth mask. 41pcs replacement filter only,the mask is not included. 5Please use it after washing your hands, and the filter cannot be cleaned or reusable.SpecificationFeatures:5-ply active carbon filter isolate most non-toxic dust,pollen,fumes,common airborne irritants and other non oil basedparticles.Suits for installing in general double air breathing valve activated carbon dust mask.(valve diameter:2.2cm/0.9in)Easy to replaced by yourself for your mouth mask.1pcs replacement filter only,the mask is not included.Please use it after washing your hands, and the filter cannot be cleaned or reusable.Specification:Material: Non-woven,active charcoal cloth,meltblown fabric,spray cotton fabricSize: 14.5*10cm/5.7*3.9inUnit weight: Approx. 3g/0.1ozPackage List:1* Active Carbon FilterPackage List1* Active Carbon Filter