NGK is setting standards in meeting highest quality demands. By employing progressive engineering we ensure a performance level to satisfy also extreme conditions. Standard Model: * OEM Quality * Triple-Gasket Sealing Process * Consistent Performance * Plug of Choice in Millions of Vehicles Iridium Model: The “secret” of the Iridium IX spark plug is its laser-welded electrode made of iridium. Thanks to its exceptional thin diameter of 0.6 mm it bundles ignition voltage, thus improving combustion at any speed. The engine runs smoothly, the motorcycle accelerates faster. Also, the high-tech metal iridium keeps the distance between the electrodes completely stable, thus preventing the engine from backfiring. Compatible with: - Ducati: Monster 1000 i.e._M, Monster 400_M, Monster 600 1994_M, Monster 600 95-98_M, Monster 600 99-01_M, Monster 750 00-_M, Monster 750 96-99_M, Monster 800 i.e._M, Monster 900 00-_M, Monster 900 93-99_M, Monster S2R 800_M, Multistrada 1000_M, Paso 750_M, Paso 906_M, SS 1000_M, SS 600_M, SS 620_M, SS 750 91-97_M, SS 900 91-97_M, ST2_M - Harley Davidson: Sporster 04-_M, V-Rod_M