medical non woven face mask 1.1ply,2ply,3ply,4ply. 2.BFE>95%, ... +20+25gsm or others 4.Color:Blue,Green,White Medical non woven face mask is made of PP material ,it has four ... 20+20+25gsm,its color is blue ,green,white.the products have passed ISO and our main market is America,Europe ... ,we can offer you good quality and reasonable price. disposable non woven surgical mask