... carbon face mask Material: Non-woven and Active Carbon highly efficient low resistance 4 Ply 4-ply active carbon face ... : Adjustable inner and outer nosepiece, suitable to any face and ensure comfortable wearing-Level: FFP1/FFP2/FFP3/N95 ... , dyeing, auto making, ship building, electronic, food industry, manufacturing, processing, environmental sterilizing, and so on. 4-ply active carbon face mask