... best control of resistor. 2.Quicker acceleration. 3.Long spark plug service life. Spark Plugs for automobile, motorcycle ... , and lawn mower Good quality & Competative price Nickel & Platinum & Iridium Electrode Spark plug for automobile, ... high quality, save gas, long life--iridium centre electrode, high quality, save gas, long lifecompatetive price, good quality, designed boxC7HSA, ...