NGK Racing Spark Plug is designed to improve the performance of the vehicle. It is constructed from durable material that is corrosion and abrasion resistant. This spark plug includes fine-wire center electrodes which provide better sparking and ignitibility. It uses metals such as platinum, gold palladium as electrode material to improve durability and lower voltage requirements. This spark plug features special insulator configuration to improve throttle response. Solid terminal nut Solid Terminal Nut Provides better sparking and enhances ignitibility Electrode material used improves durability and lowers voltage requirement Special insulator configuration improves throttle response.