The NGK Iridium IX spark plugs offer improved throttle response superior anti-fouling and high-ignitability which makes Iridium IXr ideal for the performance enthusiast even better than platinum. Iridiums extremely high melting point is perfectly suited to todays high-temperature engines delivering outstanding acceleration fuel efficiency and double to triple the lifespan of a copper core plug. - Fine iridium tip ensures high durability and a consistently stable spark. - Trivalent metal plating for superior anti-corrosion and anti-seizing properties. - Outstanding acceleration high fuel efficiency and durability. 06-17 V-Rod (NU)