100% pure copper windings in primary and secondary bobbins improve durability and provide higher resistance to internal shorts and dielectric breakdown. Thermoplastic housing withstands heat stress for enhanced durability. Internal core made from grain oriented electrical steel limits loss factor within magnetic circuit to reduce heat and ensure coil endurance. Stainless steel spring resists corrosion. Tin-plated brass terminals improve electrical contact and protect against corrosion. High-dielectric epoxy injected into case and pulled into vacuum to eliminate air pockets and prevent moisture intrusion or thermal breakdown. Silicone rubber boot withstands extreme heat to ensure superior insulation.