Bosch (4006) HR9APX Platinum Plus Spark Plug, (Pack of 1) Exclusive platinum technology in the center electrode for quicker starts, smoother acceleration and increased fuel efficiency Tapered, yttrium enhanced v-profile ground electrode provides a 25% longer performance life Lower ignition voltage requirement provides reliable cold weather starting and superior operation under all driving conditions Factory-set gap  once the proper gap is set, there's no need to re-gap Contains one spark plug