... +25gsm or others 4.Color:Blue,Green,White Medical face mask is made of PP material ,it has four kinds,1 ... ,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 can offer you good quality and reasonable price. disposable surgical mask