Each Intermotor coil on plug is constructed from reinforced fiber glass neodymium magnet technology and grain-oriented electrical steel to prolong engine life. Neodymium in the core creates the strongest magnetic field and produces max high voltage output at all speeds. Each Intermotor coil has an advanced bobbin technology, highly specialized silicone magnetic steel core along with optimized winding provide an accurate high energy output for increased engine performance. We use the high heat resistant compound for our coil on plug boot to withstanding heat stress for longer durability.