NGK Spark Plugs BPR7HIX NGK Spark Plug - Iridium IX Fine Iridium tip ensures high durability and a consistently stable spark Iridium alloy has extremely high melting point, perfect for todays 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