... ,strong tension, long service life. Fiberglass duct rodder & duct rod & fiberglass rod Duct rodder is composed of fiberglass rod which is ... polyethylene engineering plastic as it protect layer, which make duct rodder cover sliding on the surface, durable, corrosion ... colors for the rod to choose.Technical Data of Duct Rodders1. Reinforce Fiberglass core PropertyData and ValueReinforcementE-Glass ...