Mallory Pro Wires have an 8mm, red silicon jacket that are capable of withstanding temperatures up to 550°F and look great doing it. ;8mm red silicon jacket withstands temperatures up to 550°F; Available for popular Ford, Chevy and Chrysler applications; Direct fit, no cutting or splicing required; Spiral round NiCR Alloy core provides low resistance and high noise suppression; Red spark plug wire with Black plug boots;