This is the Silver Arrow V10 Series 7.5T, 2500kV, 1/8th Scale Brushless Motor from Speed Passion.  This hand wound electric motor is specifically designed for 1/8th scale off road applications.  Featuring 3 user selectable timing positions, the V10 Series can be tuned for either High Efficiency, High Power, or a balance of both. Features: Ideal for converted electric 1/8-scale off road vehicles and vehicles requiring massive power output. Sensor-based technology for excellent low-speed driveability. Rugged 5mm output shaft for improved reliability. Ball Bearings Shielded sensor cable Hand wound 3 Position adjustable timing Technical Specifications: Can Size: 543L Turns: 7.5 Resistance (Ri) Milli-ohms: 12 Input Voltage: 2S-5S (7.4V-18.5V) LiPo Amp: 3.8 Shaft Diameter: 5mm Manufacturers Recommendations: Lubricate Bearings prior to initial operation. Bearings should be inspected and lubricated after 20 runs. An External motor cooling fan should be installed for reliable operation.