Sierra International 18-5227-1 Premium MagForce 9" Marine Spark Plug Wire Lead for Mercury/Mariner Outboard Engines Kevlar core for maximum durability and long life AND Durable stainless steel wound conductor for maximum horsepower and engine performance Premium silicone jacketing and boots for ultimate high temperature protection AND Superior RFI suppression for the most sensitive electronic system Corrosion resistant stainless steel spark plug and distributor terminals for maximum conductivity Replaces: Mercury 84-813715A1 Spark Plug Wire is 9 Inches in Length and the Ignition Wire's Core is 7mm in Diameter All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty Before Ordering, Please Verify this is the Correct Part for your Application. For Assistance, Please Call Sierra's Tech Support at 1-877-663-8396