This wire set was designed using factory correct wires as a guide. They provide a perfect fit for your Grand National or Turbo Regal and are made with double pure silicone insulation braided for added pull strength. They have a Ferro spiral conductor with an ultra low resistance impregnated core which creates an effective RFI choke suppression. They are wound tight for lowest resistance available and there is a High Heat protective sleeve to protect the wires near the cylinder head resulting in maximum performance. Each wire is also numbered for trouble free installation.