MSD - 8.5MM SUPER CONDUCTOR SPARK PLUG WIRES. These Super Conductor spark plug wires from MSD have a high conductivity copper alloy wire wrapped around a special ferro-magnetic core for maximum electrical energy transfer and low electro-magnetic interference. The copper wire and ferro-magnetic core are protected by an abrasion- and heat-resistant 8.5mm silicone-synthetic sleeve and are offered with several different types of sockets to fit your ignition system. From ignitions to distributors, starters to coils, from spark plugs to plug wires, there's an MSD product to help you get the most out of your engine. Ferro-magnetic core is wrapped by a copper alloy conductor.MSD's best-performing spark plug wire. Low resistance (40-50 ohms) for high energy transfer. 8.5mm heat and abrasion resistant silicone-synthetic sleeve. Core design resists electro-magnetic interference (EMI). Comes in different socket styles. Several boot styles to fit your engine. Brand New in the Box - Fit and Quality Guaranteed! 8.5mm Super Conductor Series. Gray spark plug boot finish. Silicone spark plug boot material. Stock distributor terminal end type. Spark plug boot end type. Stock spark plug boot end type. WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. Compatible with the following vehicles.