4-ply active carbon face mask Material: Non-woven and Active Carbon highly efficient low resistance 4 Ply 4-ply active carbon face maskStandard:CE149 ... , lightweight-Hygienic, Non-irritating to skin, Odorless, and Easier breathing-Later or Later free ear band optional-Perfect ... , electronic, food industry, manufacturing, processing, environmental sterilizing, and so on. 4-ply active carbon face mask