Sierra 18-5228-1 Mercury Spark Plug WireSierra high-quality engine parts are designed to meet OEM specifications and are backed by Sierra's unmatched manufacturer's warranty. Kevlar core for maximum durability and long life; Durable stainless steel wound conductor for maximum horsepower and engine performance; Premium silicone jacketing and boots for ultimate high temperature protection; Superior RFI suppression for the most sensitive electronic system; Corrosion resistant stainless steel spark plug and distributor terminals for maximum conductivity; Size: 9" or 228.6mmInterchangeable with: Mercury Marine; 84-813715A1;