NGK CPR6EA-9 spark plug for various makes and models including the compatible with compatible with Grom. NGK traditional plugs are constructed for longer life and optimum performance. Corrugated ribs prevent flashover. N GK uses only the purest alumina silicate in its ceramic insulator which give all NGK plugs greater s NGK CPR6EA-9 spark plug for various makes and models including the fits and compatible with Honda Grom. NGK traditional plugs are constructed for longer life and optimum performance. Corrugated ribs prevent flashover. NGK uses only the purest alumina silicate in its ceramic insulator which give all NGK plugs greater strength and better heat transfer. Copper cored and triple sealed to further aid in heat removal and prevent interior leakage.