Dust mask 1.silica gel material,abs framwork 2.ISO 9000 3.single-blow box design, 4.construction,industry, timely delivery, 9001 Dust Mask: More information: Name Model PakingQuantity G/N Weight Paking Size Dust mask 9001 Carton packaging 20pcs 4/3kg 53*26*34cm Filter 9001 Carton packaging 400pcs 4/3kg silicon and high-end dust mask for construction and industry