The Accel 8.8mm 300 + Race Wire Custom Fit Sets are custom tailored for race engines and their builders. The oversize 8.8 mm wire is rated for 600 degrees Fahrenheit and 60kV. It resists heat, chemicals and moisture. High density insulation eliminates arcing. Route over/under headers. The high-density, high-temperature silicone insulation provides greater dielectric strength and eliminates arcing and the effects of corona better than the typical Original Equipment-style rubber materials. The all-Kevlar stranded inner core and fiberglass braiding and brass terminals provide unsurpassed electrical conductivity and excellent corrosion resistance compared to terminals made of common or plated materials.