Accel's state-of-the-art, U-Groove spark plugs with ground electrodes, copper glass inner seal and an electric heat seal to prevent leakage in high-compression engines+Knurled chromium-nickel alloy side wire for greater durability and greater spark with reduced voltage+Permit the spark to develop a larger, fuller flash for a more complete burn+Pure copper core decreases fouling+Extra-wide heat range+++++++++++++++++++
