Box of 20 Spark Plugs BPR6ES for Mercury MerCruiser Inboard Marine EnginesOne Box of Twenty (20) Brand New Aftermarket Replacement Standard Fits NGK BPR6ES Spark Plugs for Inboard Marine Engines Fits Mercury MerCruiser, Fits Chrysler, and Kohler Engines Solid Copper Core Aids in Heat Dissipation Corrugated Ribs to Prevent Flashover Triple Gasket Sealing Process Eliminates Gas Leakage Past the Shell 99% High Grade Pure Alumina SiliFits CATe Insulator Provides Better Heat Transfer and Superior Strength Cold Rolled Threads to