NGK variable pitch resistor cables provide uniform resistance and ensure outstanding electrical conductivity in high - quality cables. Outer EPDMsilicone jacket and inner insulation contain high voltage currents for excellent dielectric strength. NGK variable pitch magnetic core cables produce the necessary impedance to suppress interference throughout the entire frequency spectrum for exceptional EMIRFI noise suppression. OE or better specified spark plug and distributor boots ensure the highest quality fit, performance and durability in every application. Spark plug boots are glued to NGK cable with a silicone sealer for a watertight seal. Stainless steel terminals utilizing up to 3 serrated crimps bite into cable jacket and inner insulation for the highest terminal retention strength (wherever possible). Locking C - shaped spring clip with corrosion - resistant plating ensures a secure and positive spark plug terminal connection.