... Hygeian dust-free workshop made 4.quick delivery Product Description1>Non-woven Face Mask 4-ply2>ISO,CE,FDA, ... 3>17.5x9.5cm,18+20(carbon)+22+25g 4>Rapid feedback,good after-sale service 5>high BFE ... high quality coverall:SMS,SMMS,MICROPOROUS FILM,PP+PE,TYVEK;4> Gown & coat: surgical gown,Isolation gown,patient gown ... to achieve this win-win situation. disposable 4 layer nonwoven active carbon face mask