dust mask Package: 20PC/BOX, 400PC/ctn BFE>99% VFE>99% Certification:CE FFP2 N95 Materials:Non-Woven Fabric... dust mask(4plys)Package:20pcs/box, 400pcs/cartonBFE>90%,VFE>90%Certification: ISOMaterial: NON-WOVEN fabric dust maskPolypropylene material,no any toxic chemical toxiclow breathing resistence with high filtratin efficiency dust mask