... medical use 3, Effectively remove benzene, ammonia, formaldehyde, and other harmful gases and unpleasant smell4, Protect human health, widely used in chemical ... pharmaceutical, paint, fertilizer, mining and other heavy polluting industries. 5, Dimension: 17.5*9.5cm ... 2000pc/ctn or per your request7, RoHS compliant CE certified Carbon Fiber Non-woven Face mask