The hemispherical double iridium spark plug is good, and the overall quality is relatively stable. The quality of hemispherical spark plugs is quite good. First of all, this brand of spark plug belongs to the second-line spark plug brand, and the overall quality is relatively stable. Secondly, the ignition strength of this brand of spark plugs is relatively high, which can effectively improve the dynamic performance of vehicle engines. Thirdly, the performance of this double iridium spark plug is very stable. Under normal circumstances, it can be replaced after driving 50,000 to 60,000 kilometers.