Bosch (4431) FGR8MQP Platinum + 4 Spark Plug, (Pack of 1) Revolutionary surface air gap firing technology featuring multiple spark paths that delivers the longest, most powerful spark for ultimate engine performance. More platinum vs. Bosch Platinum plus for smoother acceleration, top fuel economy and maximum engine power. Four yttrium enhanced ground electrodes provides optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life. Electrode gap is factory set which never requires adjustment and ensures ease of installation.