Our Accel platinum tipped performance spark plugs are manufactured with state-of-the-art components in the good old U.S. of A. The platinum tip provides longer life and durability. Because platinum is more durable, it's able to maintain a precise gap much longer than ordinary spark plugs. By maintaining that gap with platinum, required voltage remains constant, which results in fewer miss-fires. This translates into smoother idling, quicker acceleration, and better fuel economy over the life of the plug. The knurled side wire is produced from the best high chromium-nickel alloy for greater durability and allows for greater spark with reduced voltage while the pure copper core center wire helps to decrease fouling. For performance at its best, use these Platinum spark plugs. Packed and sold in packages of two.