Feature●Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response●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●Longer insulator , the corrugated ribs on insulator prevents flashover, and a triple gasket seal eliminates combustion gas leakage●Iridium alloy has extremely high melting point, giving it high durability to heat and electrical wear, perfect for todays high performance engines●Trivalent Metal Plating provides superior anti-corrosion and anti-seizing properties. Resistor Value-5K Ohm. Hex Size-5/8 inchDescription NGK LKR7DIX-11S Iridium IX Spark Plug (93175 Iridium Ix), 4 Pack