content: I can't express how good these plugs are. They are made by a reputable brand, NGK.I purchased Autolite Iridium plugs and they caused misfirings and were bent withing 300 miles. I didn't finish 1 tank of gas yet either.For my 1998 Honda Civic EX MT, I thought I was doing a good thing by replacing the wires and plugs with Boche premium spark plug wires and autolite iridium plugs, but all I got was misfiring, bent plugs, and Almost catastrophic engine failure. The wires didn't seat properly by design flaw and popped out of the valve cover at 70mph.I was honestly scared my car was going to blow up (no joke).NGK-R plugs are the best for a reason. Don't mess with iridium and their lofty claims. They caused me a heck of time with car problems and 15% mpg loss in 300 miles. Don't take the risk and F-up your car.