3-Ply nonwoven face mask BFE>99% Color:Blue Style:Ear-loop Function:medical sanitation,lab,pharmacy 3-ply face masksize: 9.2*17.5cmmaterial: 20g pp nonwovens+20g filter fabric+25g pp nonwovenPacking : 50pca/box,20box/carton, or 40box/cartonFunction: 3-ply structure , BFE up to 99% can pretect user from any kind of fluProduction technique: ultrasonic machine-sewed, with earloops and nosepiece. ...