Mallory 360 Rotor/Shutter Wheel Developed specifically for 37 and 38 Series distributors Perfect fit for YLU Series electronic distributors Delivers unrestricted energy flow Features corrosion resistant brass inserts and stainless steel rotor springs Made of an innovative, space age plastic with high dielectric strength that's ideal for today's high energy ignitions Designed to provide high impact-resistant qualities to prevent damage Made from space-age plastic Facilitates high dielectric strength Features unrestricted energy flow Easy to install