You can depend on NGK for quality and reliabilityNGK performance wires are custom manufactured for your vehicle, all have original equipment identical connections, but are constructed with superior quality cabling. The NGK ferrite magnetic core wire has only 1/2 the resistance of traditional carbon core wires, yet has all the same RFI suppression capabilities. In addition, traditional carbon core wires have a tendency to increase resistance with age while NGK's wire wound ferrite magnetic cables remain virtually unchanged. This means more power to the spark plug to begin with, plus longer life. Oil and high heat resistant (250 deg. celcius) silicone outer jacket. Technical Specifications - Custom performance wire set with ferrite magnetic core. Wire Length No.1 442mm 17.4in. Wire Length No.2 482mm 18.98in. Wire Length No.3 622mm 24.49in. Wire Length No.4 662mm 26.06in. Coil Wire Not Included