NGK Spark Plug (Each) DR9EIX NGK has been developing spark plug technology since the 1930s and manufacture plugs for every type of automotive engine, as well as for motorcycles, marine, horticultural, plant and many other applications. In fact NGK produces and stocks over 1,000 different types of spark plug and every product matches even the most demanding manufacturers specifications. The vast experience and technology that NGK has ensures that there is no doubt that NGK are the world No.1 spark plug. The Spark Plug Serious Enthusiasts Rely On Designed specifically for the performance enthusiast.  Iridium IX® offers extreme ignitability, improved throttle response and superior anti fouling Fine Iridium tip ensures high durability and a consistently stable spark Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties Outstanding acceleration, high fuel efficiency and durability Ultimate design, technology and performance.