medical non woven face mask 1.1ply,2ply,3ply,4ply. 2.BFE>95%,BFE>99% 3.20+20+25gsm or others 4.Color:Blue,Green,White Medical non woven face mask is made of PP material ,it has four kinds,1-ply,2ply,3-plys,4ply.the BFE is more than 95%--99% ,and its weight is 20+20+25gsm,its color is blue ,green,white.the products have passed ISO and our main market is America,Europe,Asia,etc.at the same time ,we ...