Performance Distributors “Live Wires” spark plug wires have a spiral-wound core, dura-ble silicone outer jacket, and space-age, heat resistant sleeving for optimum spark travel and prevention of electronic interference. Sleeving is effective from-76°F to +1,400°F, maintaining resistance to moisture and chemicals. Black, plug wires are custom fit with no assembly required. S/B Chevy, over valve cover, HEI, 90 degree boot. Please e-mail with questions.