Features:

• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
• Triple seals prevent leakage
• Corrugated ribs prevent flashover
• Copper core aids in heat removal

Fits Harley M8's. Spark plug models fit a wide variety of motors.  You're responsible for referencing the exact fitment of NGK plugs for your year, make, and model before purchasing.