Hobbypower Spark Glow Plug No.3 N3 Hot 70117 for RC Nitro Engines Car Truck Traxxas (pack of 10 pcs) Please refer to your instruction manual and make sure it's compatible. For 5% - 40% Nitro Fuels For 4c Engines Compatible with: SHOCKWAVE, TSUNAMI, VOLCANO STX, TORNADO S30, VOLCANO S30, AFTERSHOCK 21, HURRICANE XL, AFTERSHOCK 3.0, AFTERSHOCK 3.5, BACKDRAFT 3.5, CALDERA 3.0, EARTHQUAKE 3.0, EARTHQUAKE 3.5, HURRICANE XP, LANDSLIDE 21, LANDSLIDE LT, MAELSTROM LT, MONSOON XP, SANDSTORM 21, SANDSTORM LT, TWISTER LT, TYPHOON XP, REACTOR RS 3.3, VOLCANO MX, VOLCANO SV, VOLCANO T2, VORTEX SS, TORNADO BB and more... Medium for club racing and sport use.