Champion J12YC (10) Copper Plus Spark Plug, Pack of 4 Durable: Champion copper plus spark plugs are built to ISO and SAE standards for proven performance; Champion's patented SAC-9 semi-conductor resistor provides maximum EMI and RFI suppression Champion copper plus spark plugs use TinTac and Ultraseal Shells, this eliminates the need for the use of anti-seize compound during installation by providing the best corrosion protection of any spark plug in the industry Champion copper plus small engine spark plugs are built by a world leader in small engine spark plugs to deliver proven performance The Champion copper plus spark plug features a copper core electrode that provides increased conductivity and heat control while delivering good overall wear characteristics Provides longer life; Copper core center electrode allows for accurate control of the plug's heat range, optimizing the plug's performance and adding to the longevity of the spark plug  See more product details