1.Conductive flexible duct. 2.made of fire-retardant pvc material and helix steel wire Antistatic . 3.antistatic duct. antistatic flexible duct1,made of fire-retardant pvc material and helix steel wire2,PVC Thickness:0.35mm-0.65mm3,Diameter:4" to 60" stander length:5m or 10m4,Main color: black, orange ect.5,Character: enduring high temparature,acid,alkali,oleic acid, harmful liquid state gas ect. ...