Bosch 09325 Wire Set Stainless steel Mag winding delivers maximum voltage to the spark plug for a hotter, more powerful, and longer spark resulting in optimum engine performance while reducing the chance for misfire, and eliminating radio static 100% pure silicone jacket is totally resistant to oil penetration for lifetime protection against wire set failure Kevlar reinforced core for long life EPDM inner insulation stops power-robbing voltage leaks Snug fitting OEM-style silicone boots ensure proper fit, function and appearance while providing extreme durability for long life