Atomik RC 540 55T Brushed Motor + 320A Waterproof ESC Combo - 1:10 Rock Crawlers Waterproof ESC Small Footprint (40 x 34 x 34mm) (4-7 Cell NiMH/NiCD) 2 Cell LiPO 5 volt 1 amp BEC Motor Shaft: 1/8 inch