NGK RC-NX13 Spark Plug Wire Set Set includes 4 wires (Coil Lead N/R) Variable pitch winding delivers ultra-low resistance, a powerful spark and outstanding EMI/RFI noise suppression Numbered for easy cylinder identification and coil wires are color coded for correct and easy installation Positive-locking, corrosion-resistant stainless steel terminal ends for tight fit and maximum resistance to vibration and separation High-temp (250+ C / 482+ F) silicone outer jacket resists moisture, oil/petrol and cracking due to temperature extremes