This is a pack of two optional Tekin 25V 2700uF Power Capacitors. While not necessary for most standard applications, sometimes specialty projects, such as speed runs, puller rigs or other high amp draw applications that experience extreme amp spikes require a stout capacitor.
Tekin caps are high-quality polymer caps and perform the important task of absorbing voltage spikes between the ESC and battery. Running multiple caps in series can reduce temperatures and improve performance! Package includes two capacitors.