3 py face mask : 1) material : non-woven 2)BFE>95% 3)Professional manufacture 4) good effect against dust 3 ply face mask1.3 ply composition with quality filter layer2. hygenic ,clean3. maintenance free4. easy to use5. asjustable nose piece,ensures comfortable wearing.6. accept OEM production.7. low prices for good value8. bring breathing exhalation valve with inner silicon piece canfacilitate ...