Features Designed to operate over a much wider heat range than ordinary plugs; Resists carbon buildup and pre-ignition; High alumina ceramics for better heat transfer and electrical insulation; Solid copper core and nickel tipped electrode provide a longer plus life; Patented triple gasket sealing process eliminates the possibility of combustion gas leakage; Solid copper core for greater spark; Longer insulator nose prevents fouling; Specifications Material: Nickel; Size: 2.5mm; Dimension: 1\" H x 4\" W x 3.5\" L; Weight: 0.6 lbs; .