This is the Hobbywing EZRun 1/18 Scale 2030 Series 5200kV Brushless Motor. Let your mini racer or monster rip! The Hobbywing 2030 Series provides excellent options for 1/18 scale applications and provide excellent motors for those looking to step-up the speed. Features: Dustproof Powerful 5,200kV Uses top quality materials: Aluminum shell (case) High quality magnets Copper wires of high temperature endurance Good quality bearings Specifications: kV: 5200 (18T) Motor Diameter: 20mm Motor Length: 30mm Shaft Diameter: 2mm Shaft Length: 10mm Weight: 46g