... respiratory resistence 3.High filtrability 4.Cup Shape Style Dust mask 1) Meeting the international quality criteria(Europe): ... filtering materials effectively filter the solid particle dust, and prevent the oil liquid gas.5) Use for construction, mining, textile ... cement, agriculture and animal husbandry, cutting dust, pollutes from heavy metal.Packing: 50PCS/box, 20boxes/CTN;Size: 60*27*24CMG. ...