Setting a New Standard in the High Performance Wire. . with Two Popular Conductors, Resistor Core or Wire Core8mm 100% pure silicone insulation, fiberglass reinforced jacket Double spring locking spark plug terminals provide a firm grip on plugs Popular resistor core has 40% less resistance (more fire power) than most resistor conductors TCW (Tinned Copper Weld) Wire core for racing applications and where RFI is not a concern Your choice of 4 colors The Perfect Wire for any Performance Vehicle, meeting the Demands of Today's High Tech Ignitions. . Pro Wire is a Great Choice!Pro Series Wires are designed to withstand over 600°F with a 100% pure silicone jacket. Taylor offers the best selection of colors to detail your engine. The most popular wire is offered with two types of conductors: Resistor Core for the high energy ignition systems on your street vehicle or TCW Wire Core for racing. Pro Series Wires are engineered to work high under hood temperatures. Connections are the finest double spring lock terminals available. Pro Series Wires will give you the edge on the street or at the track.Pit Stop USA offers Taylor 8mm Pro Wires Universal Spark Plug Wire Set - Blue - TCW Wire Conductor - Vertex Style 90° Plug Boots - 8 Cylinder Applications 70660 at low everyday prices. Be sure to check out all of our products from Taylor Cable Products including Taylor Cable Products 8mm Pro Wires.