1.4-ply active carbon mask 2.Size: 17.5*9.5cm 3.Certification: ISO9001, CE 4.BFE>95% 5.Color: white, green, blue, etc >Spp mask loaded with active carbon pre-filter,breathe well>Protection against airborne particles and bad odor>Meet B.F.E. 99%>Special 4 layer pleated design>Regular:SPP 18/40/20/25g.>Size:17.5*9.5cm>Color:white,green,blue,etc>Nose line:full plastic or aluminium strip