Mallory Distributor Replacement Part. Rotor is constructed from an innovative plastic that combines the high dielectric strength required for today's high energy ignition system and high impact-resistant qualities to prevent damage.Corrosion-resistant inserts and rotor springs provide an unrestricted energy flow. Constructed from an innovative plastic Incredible strength and high dielectric properties High impact-resistant qualities to prevent damage Corrosion-resistant brass inserts Stainless steel rotor springs to provide an unrestricted energy flow