Respirator mask, (1) High quality silica gel. (2) ISO 9000, (3) Material replacement easy, ( ... ] : Good materials, superior sealing performance, wearing comfort.[Performance] : Effective filtration of gas, benzene, chlorine, chloroform and other toxic gases.[Model] : FD ... *34cmCartridgeA/3LH-03BCartonpackaging50pcs6/5KG46*31*15cmK/4LH-04BE/7LH-07B high-end Respirator Mask of good quality for industry