This range of NGK copper core plugs are suitable for the Honda GX range of engines found in Prokarts and Honda cadet karts. The plugs all comply with the MSA regulations for kart racing. Fits: Honda GX120, Honda GX160 & Honda GX200. There are 4 options of plug available: --BP6ES - Slightly colder running plug --BPR6ES - As above but includes a resistor to reduce electrical noise --BP5ES - Slightly hotter running plug --BPR5ES - As above but includes a resistor to reduce electrical noise LISTING IS FOR A SINGLE SPARK PLUG.