The secret of the new Iridium IX spark plug is the laser-welded iridium electrode. Through its "minimal" diameter of just 0.6 millimeters, the ignition voltage is packaged. The advantages of Iridium IX spark plugs at a glance The optimal ignition characteristics of Iridium IX spark plugs prevent fouling in stop and go traffic. Misfires or misfires can be prevented. This reduces emissions and saves (if present) the catalytic converter and the environment. The Iridium IX spark plugs ensure "round" engine running, increase the driving experience through better acceleration and thus offer more driving fun. The Iridium IX spark plug lasts at least twice as long as a regular spark plug. Frequent candles are so "off". Which in turn reduces costs. Maximum ignition reliability, uniform combustion, optimal engine performance, throttle response are the result of modern technology and reduce fuel consumption. The optimized shape of the electrode reduces the ignition voltage, protects the engine and ensures "round" operation.