Sierra Premium Marine Spark Plug Wires #18-8810 Replaces OEM # Mercruiser 84-916761Q16 Magnetic Suppression Core manufactured for your specific application, OE style boots provide a sealed barrier against heat, dirt and moisture. 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 the ultimate in high temperature protection. Superior RFI suppression for the most sensitive electronic system. Corrosion resistant Stainless steel spark plug and distributor terminals for maximum conductivity.