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DENSO's Iridium TT spark plugs are designed to meet the demands of modern engines, providing enhanced ignition and a more complete burn. The advanced Iridium TT alloy used in the center electrode ensures exceptional durability and a high melting point, allowing for a finer electrode tip. This finer tip reduces the required voltage for ignition, leading to improved fuel economy and smoother engine operation. These spark plugs are built for extended service intervals, offering reliable performance over a longer lifespan compared to conventional spark plugs. They are an excellent choice for drivers seeking to maintain or improve their vehicle's engine performance and efficiency.