Parts are molded from high quality voltage insulating materialsResists carbon tracking while ensuring that the ignition spark reaches the spark plug terminalsLow resistance brass is used for maximum voltage transferPerformance replacement OE partMSD molds our most popular v8 distributor caps in-house. These caps are injection molded from DuPont Rynite material and feature spark plug-style terminals. These terminals offer improved locking connections and the Rynite material is extremely strong with excellent dielectric properties.