1:8 Tyre warmers. Available in Red or Green color.
 
These warmers will operate with 4S Lipo or input of 12 -20V from power supply.
They have there own built in thermostat which is set to 65 degrees celsius, the warmers will keep the tyres at this optimum working range between time on the track.
 
An led indicator on each warmer indicates they are on and working.