Taylor's 8.2mm diameter Thunder Volt high performance ignition wires are available for street or track applications.50 Ohm Ferrite Spiral-Wound coated core blend of exclusive copper/nickel alloy bonded by a conductive acrylic cover. 100% Zimplex Silicone 2-layer Outer Jacket for added Heat Protection up to 600º F, extending wire life and performance. DYNO Tested to outperform the competition in Spark Energy, Horsepower Increases and Significant Torque Gains. Smoother Idle and Improved Fuel Economy. Works with Factory Wire Looms. Universal-Fit, Race-Fit, and Custom-Fit Sets available in Black, Red, and Blue colors with Grey 600º Silicone plug boots.