This is the Castle Creations 2028 780kV Sensorless Brushless Motor. FEATURES: Designed for 1/5 scale off-road vehicles such as the HPI Baja series Sealed to keep out dirt and moisture Rotor is assembled with four 4-pole neodymium magnets Advanced slotted design stator with super thin steel laminations High-quality sealed ball bearings 8mm hardened steel shaft INCLUDES: Castle Creations 2028 780kV Brushless Motor with 8AWG Motor Leads and 5mm Female Bullet Connectors REQUIRES: Sensorless elecronic speed control SPECS: Length: 4.4" (113.2mm) Diameter: 2.2" (57mm) with fins Shaft Diameter: 0.31" (8mm) Shaft Length: 1.18" (30mm) Weight: 44oz (1247g) Max RPM: 30,000 kV: 780 Motor Mount Spacing: 1.18" (30mm) jxs 09/09/11 ir/jxs