The patented DENSO iridium alloy is extremely hard and wear-resistant.This makes it possible to produce a spark plug with a central electrode of only 0.4 mm, which produces a more intense spark with better ignition performance under any driving conditions.These candles can withstand even the most severe conditions, and have been confirmed in the original equipment and competitions.This product guarantees DENSO the leading position in the field of iridium candle technology.