NGK TR5IX Spark PlugNGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Provides outstanding acceleration, high fuel efficiency and durability. Part Number: TR5IX; Stock Number: 7397; Resistance (Ohm): 5000; Ground configuration: Standard; Ground electrode core material: Nickel; Center electrode core material: Copper; Center electrode tip material: Iridium; Fits DOD/EAG 1992-88; FORD/LIN/MERC 2012-74; GM 2014-75; JAG 1988-77; MAZ 2009-94; M-BENZ 1993-84; VOL 1990-76, I/O - 2005-94 INDMAR, 2000-98 MARINE PWR, 2006-00 MERC, 1998-87 OMCCheck your engine and maintenance manual for the correct spark plug and only use as recommended by your engine's original equipment manufacturer. Using the wrong plug can reducing optimum performance, reduce fuel economy or cause damage to your engine.