It is in Black with 90 Degree Boot for HEI Distributor, and Black 90 Degree Boot for Spark Plug. For TBI EFI Distributors. In order to resist damage from heat and abrasion, the wires itself have a high dielectric strength insulator and are made of heavy glass braid for added pull strength, topped with heavy-duty heat resistant silicone jackets and high-temperature black boots.