Champion Spark Plugs Champion Spark Plugs RA6HC 4 High quality plugs with all the features that makes Champion spark plugs the industry's leader. Triple coated shell for excellent corrosion resistance. Triple seal assembly the strongest in the industry. Precision tooled threads conform to all manufacturers' specifications. Closed sides for a comfortable fit Three adjustable belts Sturdy nylon shell with durable Crosstech flotation foam Adjustable leg strap