NGK Spark Plug BR8ES-S 3961 Standard Copper Core, Pack of 16

NGK (3961) BR8ES-S Standard Spark Plug. This product comes in a pack of 16 spark plugs. Features a copper core material. The spark plug has a thread size of M10x1.0. Equipped with a metal top material type. Suitable for snowmobile and watercraft vehicle service types. Constructed for longer life and optimum performance. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Corrugated ribs are designed to prevent flashover. Includes a pure alumina silicate ceramic insulator for superior strength and better heat transfer. The copper core aids in efficient heat removal.