The very latest generation (2025) of the Warhead Industries CNC brushless rotor. 

The only brushless airsoft rotor to be laser balanced for maximum efficiency. 
Solder and flux are required to install this rotor (to desolder and resolder the ESC). 
 
For best results we recommend Stannol or Multicore brand lead-free silver solder and MG Chemicals No-Clean flux as well as a (minimum) 60W temperature-controllable soldering iron set to 400 degrees C using a chisel tip. 
 
We are the official UK Warhead Industries warranty and repair centre so please do drop us a line if you have any issues, questions or would like us to install this controller for you.