Iridium spark plugs are a type of spark plug that is known for its durability and longevity. Unlike traditional copper spark plugs that require replacement every 30,000 miles, iridium spark plugs can last up to 100,000 miles. This is because iridium is a harder and more durable metal than copper. Iridium spark plugs also provide better ignition performance, resulting in improved fuel efficiency and lower emissions. Additionally, iridium spark plugs are less likely to foul or corrode, ensuring consistent engine performance throughout their lifespan. Overall, iridium spark plugs offer several benefits, including improved durability, performance, fuel efficiency, and lower emissions.