ACDelco E552C Professional Ignition Coil High quality coated windings to improve durability and provide protection against internal shorts and dielectric breakdown Silicone steel plates surrounding the ignition coil correctly match the original part size and number exactly Laminations are coated to hinder corrosion and many feature molded plastic protection to help ensure that nothing is exposed Undergo stringent testing, often under extreme or unusual conditions, to help deliver the quality parts you expect from ACDelco Professional, premium aftermarket replacement Manufactured to meet expectations for fit, form, and function to provide the performance and dependability you expect from ACDelco