Generally, hot plugs provide better idle and acceleration than cold plugs. Cold plugs will produce more power but may idle more roughly and be harder to tune.
| #6 | Hot | A long-lasting plug for most .10-.60 2-strokes |
| P3 | Ultra Hot | For 21VZ-B V-Spec and most .18-.28 off-road racing Turbo head engines |
| P4 | Super Hot | For 21VZ-B V-Spec and most .18-.28 off-road racing Turbo head engines |
| P5 | Very Hot | For 21VZ-B V-Spec and most .18-.28 off-road racing Turbo head engines, especially when the temperature is high or for leaner needle settings and high-nitro/high-rpm running |
| LC3 | Hot | Long reach, for 1/10 scale off-road engines such as O.S. 21TMs and Traxxas® peak needle settings and punchy throttle response |
| #7 | Medium Hot | For 2-stroke airplane, helicopter and car (except Turbo head) engines. Offers stable idling, broad peak needle settings and punchy throttle response |
| RP6 | Medium | For most .12-.21 on-road racing Turbo head engines |
| LC4 | Medium | Long reach, for 1/10 scale off-road engines such as O.S. 21TMs and the Traxxas TRX2.5 & 3.3™ engines |
| #8 | Medium | A favorite for most 2-stroke engines |
| RP7 | Cold | For most .12-.21 on-road racing Turbo head engines |
| RP8 | Cold | Outlast the hottest heats with Turbo head engines |
| #10 | Cold | Ideal for aircraft engines .60-size and up |
| R5 | Cold | For leaner needle settings and high-nitro/high-rpm scale racing |
| F | 4-Stroke | Long reach and long life for 4-stroke engines |