Rapid racing drone spare parts rapid 4032 these escs electronic speed controllers are the same as the ones used in the rapid racing drone kit 70 1141 so are ideal spares or replacements they can also be used in your scratch built projects for brushless motors up to 20aarmed with bl heli s these pocket rocket 20a escs match all modern standards they have an efm8bb21 mcu dedicated drive chips and a 3 oz gold plated pcb the components have been placed and soldered to an amazing standard