NGK Iridium IX Spark Plugs
NGK Solid Resistor Spark Plugs are treated with corrosion resistant plating to ensure ease of installation and removal. The 98% pure copper core delivers increased heat dissipation for more reliable starts and reduced risk of overheating. Cold-rolled threads prevent cross-threading and damage to cylinder heads. Trivalent plating eliminates need for anti-seize. Corrugated ribs prevent flashover. High-grade alumina silicate ceramic.
Iridium is significantly stronger than any other metal used in spark plugs today. The ignitability and durability is better than platinum. Sold in boxes of 4
The BR8EIX spark plug is not a Solid Top.
Iridium plugs are gapped at NGK. If you try to gap the plugs yourself you will damage the center electrode