... 1.MF11B activated carbon filter gas mask(Silica Gel gas mask) 2.ISO9001,CEcertificate,GB2890-1995 3.supply sample MF11B type gas mask1. Product ... in industry, agriculture, storehouses, scientific research work, etc.MF11B gas maskProduct featuresHead harness typeWith voicemeter , comfortab to wearFacepiece moulded in ... , (small, medium, large)9)Packing: Carton box MF11B activated carbon filter gas mask