Duct rodder are composed of fiber glass rod which is extruded by fiber glass and 

high strength resin at high temperature. This type of rod has high tensile 

strength and flexibility. It was covered by a high density polyethylene 

engineering plastic as its protect layer,which make duct rodder cover sliding on 

surface,durable,corrosion resistant and has good insulation performance,which 

make them safe for using in cable occupied duct. High Density polyethylene(grade: 

for insulating and jacketing of Telecommunication cables) is used in the outer 

diameter coating. Duct rodder will be equipped with different size reel according 

to the length of rod. There are wheels on the reel,which make it convenient for 

moving.