NEW: Spektrum Firma 100A Brushless Smart ESC. 3S w/ 3200kv Motor Combo SPMX. Removed from a brand new, never-run Arrma Vortex 4×4 3S BLX RTR. No retail packaging is included. 18 & 20 tooth pinion gears. Direct factory replacement for the following Arrma vehicles: Vorteks 4×4 3s BLX. Senton 4×4 3s BLX. Granite 4×4 3s BLX. Typhon 4×4 3s BLX. Big Rock 4×4 3s BLX.