Heavy-duty yttrium enhanced nickel-copper center electrode ensures superior reliability and durability for up to 50% longer performance life vs. standard copper plugs
Copper core provides broader heat range to resist pre-ignition and deposit build-up
Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize - saving time
Angled, ribbed insulator design prevents misfire due to flash-over
Metal glass fused resistor maximizes interference suppression
Compatible with select vehicles including, but not limited to, the following (Note: engine affects fitment - verify specific fitment details with amazon confirmed fit fit checker above): ALFA ROMEO: 81-86 GTV-6, 72-93 Spider; BERTONE: 84-89 X-1/9