Outer protect layer are made of high density polyethylene engineering plastic, which Duct rodder/ Cobra Conduit Rod is composed of fiberglass rod which is extruded by fiber glass rod and high strength resin at high temperature.This type of rod has high tensile strength and flexibility. It is covered imported ABS engineering plastic as it protect layer,which make duct rodder cover sliding on the surface, durable, corrosion resistant and has good insulation performance.Which make them safe for use in cable pulling in the conduit. Duct rodders will equipped with different size reel according to the length of rod. There are wheels on the reel, which could make it easy to move. has good anti-UV capability. Cover was coated with long-term UV-resistant polyethylene.