The product is a set of 8 Acdelco 12639701 glow plugs designed for LMM and LML Duramax Silverado and Sierra 6.6L diesel trucks. These direct replacement glow plugs come with a lifetime manufacturer warranty, ensuring high quality and durability. Made by the original equipment manufacturer (OEM), these glow plugs are a reliable and essential component for maintaining proper ignition and performance in diesel vehicles.