10 pieces disposable mask replacement non-woven mat pad reusable cushion

material: made of non-woven cloth, melt-blown filter cloth and nanofiltration fabric, 4-layer filter system effectively keep away from pm 2.5 and a range of airborne contaminants. compatible with most dust masks, easy to insert or replace the original one. each filter is packaged individually, secure and sanitary. recommend replace filter once a day for the effect.