NGK Laser Iridium Spark Plug IMR9C 9H Pro Series Flexible tips are Pro Series Flexible tips are CNC machined billet aluminum and feature a spring loaded rotatable tip which under impact such as in a rut will spin to reduce damage Set of piston rings Ø79mm for VERTEX 9224D 100 PISTON Platinum disc welded to backside of ground electrode providing longer life margin:0pt 0pt 0pt 0pt