Magnetic Suppression Core manufactured for your specific application.Kevlar® core for maximum durability and long lifeDurable stainless steel wound conductor for maximum horsepower and engine performancePremium silicone jacketing and boots for the ultimate in high temperature protectionSuperior RFI suppression for the most sensitive electronic systemCorrosion resistant stainless steel spark plug and distributor terminals for maximum conductivityOE style boots provide a sealed barrier against heat, dirt and moistureThunderbolt type ignitionApplicacation: Flagship, Indmar, Marine Power & Mastercraft - 181, 3.0L, 4 cylinder, conventional ignition. Mercruiser - 120, 140 hp, 2.5L & 3.0L 4 cylinder, conventional ignition. OMC Sterndrive/Cobra - 100 ('72-'73), 110 ('64), 120 ('65-'74), 140 FF & R model ('73-'74), 140 R1 model only ('74-'81) & 140 Jet ('73), 2.5L ('82-'86) & 3.0L ('82-'90), 4 cylinder, conventional ignition