Description: 4 Pole 6 Slot Hi-torque Motor Design CNC Machined 6061 T6 Billet Aluminum Heatsink Can High Purity Copper Windings Maximizes Efficiency High RPM ABEC5 Oversized Bearings Universal fit,fits all 1/16,1/18 brushless cars-multi-mounting system for M2.5 screws Precision balanced rotor,smoothness for best reliability and maximum RPM Stator - Super Thin (0.2mm) Laminations Precision Engineered for Maximum Energy Conversion Specification: Model: 2040 KV: 3900Kv T: 16T Connector: 3.5mm Golden Max RPM: 50000 Resistance: 0.0604 Max Voltage: 12.6V Watts: 220 Max Amps: 16A Length of extens shaft: 10mm Size Chart: LxD: 38x20mm/ 1.5x0.79inch Package Includes: 1 Piece Brushless Sensorless 2040 3900kv Motor