6777 NGK (IMR9C-9H) Iridium Spark Plug (Quantity 2 Per Order) Fine Iridium tip ensures high durability and a consistently stable spark Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties Iridium alloy has extremely high melting point, perfect for todays high-tech, high-performance engines Outstanding acceleration, high fuel efficiency and durability Each Order Contains (2) Two Spark Plugs.