Set of 10 Fits NGK BPR6ES/7131 Standard Spark Plugs for Inboard Marine EnginesOne Set of Ten (10) Brand New Aftermarket Replacement Standard Fits NGK Spark Plugs Fits Chrysler and MerCruiser Inboard Engines Replaces Part Numbers: BPR6ES, 7131 Triple Gasket Sealing Process Eliminates Gas Leakage Past the Shell 99% High Grade Pure Alumina Sili Fits CATe Insulator Provides Better Heat Transfer and Superior Strength Solid Copper Core Aids in Heat Dissipation Corrugated Ribs to Prevent Flashover Cold Rolled Threads to Prevent Damage