NGK Iridium IX Spark Plugs. Model: Iridium IX Spark Plugs. Made of Iridium. Manufacturer: NGK. Represents the ultimate evolution of spark plugs. They may opt to repair or replace the item at their discretion.
I run these in my Pro Street Harley Shovelhead with a full race cam and they last longer than other brands before fouling (runs rich at idle). They also came as original equipment in my Supercharged Crossfire SRT-6. I recently replaced those 12 at 100K miles , and they didn't really look that bad even after 11 years and that many miles on that vehicle.