NGK (5464-4PK) Iridium IX Spark Plug， (Box of 4)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Designed specifically for the performance enthusiast， Iridium IX offers extreme ignitability， improved throttle response and superior anti-fouling</li><li>The 0.6 millimeter laser welded fine Iridium tip ensures high durability and a consistently stable spark and the tapered ground electrode minimizes electrical quenching effect</li><li>Longer insulator nose prevents fouling， the corrugated ribs on insulator prevents flashover， and a triple gasket seal eliminates combustion gas leakage</li><li>Iridium alloy has extremely high melting point， giving it high durability to heat and electrical wear， perfect for today's high performance engines</li><li>Trivalent Metal Plating provides superior anti-corrosion and anti-seizing properties; Part number of spark plug inside the box: BKR5EIX-11</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31fAfUgipmL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/415%2BlVYlo1L.jpg" noproxy>