... :Blue,white,green 4.Certificate:ISO,CE,FDA,GOST PP 2-ply face mask, elastic typeColour: White, Red, Blue, Green, Yellow, GerySize ... is makde of PP nonwoven,Regularly it is 3 ply.The outside ply is made of 20gsm PP nonwoven.And it is ... gsm filter in the center.Th inside ply is also make of 20Ggsm PP nonwoven. Disposable non-woven PP 2-ply face mask