... free of maintance 4.singele 160g moulded respirator protection,respirator mask,half facepiece 1.Description:Product Name ... Convenient And Practical8.Applicable For Hospital,Common Sanitary Protection,Mainly Used In Places With Little Dust9.Conforms ... Precision Manufacturing,Food,Cleaning Work,Battery,Building Materials,Chemical Synthesis,Nuclear Engineering,Minning,Petroleum,Shipbuilding,Metallurgy,Coal ...