Prestolite 126055 ProConnect Gray Professional O.E Grade Ignition Wire Set Prestolite ProConnect Professional Grade ignition wire set meets or exceeds original equipment specifications. They use original equipment specified length and insulators so it looks and functions just like the one from the factory. The wire construction starts with carbon impregnated fiber glass core, then a fiber glass braid for added strength, then conductive silicone for high temperature performance. Prestosil insulation for superior dielectric and heat performance and a reinforcing member for added strength and then is finished with a Class E silicone jacket to withstand heat, cold, chemicals and moisture. It is also manufactured with wire winding for critical EMI/RFI noise suppression.