half gas mask 1.rubber of good quality, 2. with activated carbon cartridge, 3.A.K.E cartridge,light weight, 4 ISO 9000, 9001 respirator gas mask 1. rubber of good quality, aging-resistance 2.with activated carbon cartridge, and unique design of filter 3. airtight mattress 4. light and handy, enviroment-friendly cartridge 5.A.K.E three kinds of cartridge 6. protect the wearer from inhaling ...