Brisk Silver Racing spark plugs are the best solution for high performance and racing engines. They provide many unique and beneficial characteristics, taking spark plug technology to a whole new level. They're built with a silver fine wire center electrode; tapered ground electrode, and high-dialectic strength insulator. Silver Racing plugs offer a special design for hard-to-ignite fuels. Select the model and options you prefer for your vehicle.Key product benefits include:* Silver is the best electric and heat conductor* Superior ignition ability increases engine power* Lower required supplied ignition voltage* Good resistance to fouling and easier startsSilver Racing spark plugs are ideal for these applications:* Race engines and engines with hard-to-ignite fuels* Supercharged, turbocharged, or nitrous engines* Total loss ignition systems* High mileage vehicles