Specifications: The Source/Staring Coils are used to charge the capacitor in CDI units. The Source coil is the main Element to get best engine performance at all speeds. Our coils are made using high insulation grade Fine copper wire with proper gauge and turns and insulated with superior grade chemicals to make them trouble free for long life span. They are also rated for frequent short circuit withstanding capability and able to generate the rated emf at all speeds.