High-performance iridium spark plugs designed for Toyota Prius 2004-2009 models with precise OEM fitment (90919-01240). Premium iridium center electrode ensures superior conductivity and extended 60% longer lifespan than standard plugs. Laser-welded tip technology guarantees consistent spark energy for optimized fuel combustion. Ultra-fine 0.6mm iridium tip minimizes voltage requirements while maximizing flame kernel growth. Triple gasket seal prevents gas leakage under extreme pressure conditions. Precision-engineered thermal characteristics match factory specifications for hybrid engine efficiency. Corrosion-resistant nickel-plated shell withstands harsh underhood environments. Ideal for eco-conscious drivers seeking OEM-grade performance with aftermarket affordability. Direct replacement part requiring no ECU adjustments or special tools for installation. Batch-tested for consistent quality with individual performance certification.