The secret of the new Iridium IX spark plug is the laser welded electrode made of iridium. Through its "minimum" diameter of only 0.6 mm it bundles ignition voltage. The advantages of the Iridium IX spark plug at a glance The optimal ignition characteristics of the Iridium IX spark plugs avoid soot deposits in stop and go traffic. Misfire or misfire can be prevented. This reduces emissions and conserves (if present) the catalytic converter and the environment. The Iridium IX spark plugs ensure "round" engine operation, increase the driving experience through better acceleration and therefore offer greater driving pleasure. The Iridium IX spark plug holds at least twice as long as any regular spark plug. frequent change of candles are so "out". This in turn reduces the cost. Maximum ignition reliability, uniform combustion, optimal engine performance, throttle response are the result of modern technology and reduce fuel consumption. The optimized electrode shape reduces the ignition voltage, protects the engine and ensures a "round" ride.