First corrugated sleeve, and there are many kinds of material, corrugated sleeve common PA/PE/PP, even join nylon. Automotive wiring harness on the most commonly used material is PP (polypropylene), its main features are high voltage resistance. Corrosion. Rubbing. Impedance is high, and there's one of the most important feature of flame retardant, which is automotive wiring harness parts using it as external protection of important reasons.

The corrugated sleeve needs to be opened longitudinally before entering the factory. If manual cutting (hand tools) is intended, it is better to choose the opening. If you plan to use machine processing, it is better to choose no opening, because most machines cannot process the corrugated sleeve that has been opened longitudinally. The reason is very simple, when the blade presses down to cut the sleeve, the casing with the opening will collapse under the pressure and cannot be processed.