0.7mm iridium tipped laser welded fine wire center electrode and platinum tipped ground electrode.
. Denso 3439 FXE20HR11 Iridium Long Life Spark Plug - 12 mm - Gasket - Solid - Fine Wire - Platinum Ground Electrode - Resistor Purified alumina powder insulator provides exceptional strength and thermal conductivity.Denso iridium long life spark plugs are factory installed on luxury vehicles by automakers such as GM, Toyota, Honda and Mitsubishi. 100% pre-fired to assure the highest quality possible.