NGK offers you spark plug caps designed with an internal resistance generally around 5 kΩ to reduce electromagnetic and radio interference, thus avoiding disturbances to the ignition system and improving overall engine performance. They are made from high-quality materials such as phenolic resin and EPDM rubber, ensuring excellent resistance to heat, vibration and humidity, while guaranteeing high durability and consistent reliability. Their design incorporates a ceramic resistive element ensuring stable sparking and protection against parasitic discharges, contributing to more precise and consistent ignition even under intensive conditions of use.