1. Mechanized metal front housing with four fan-style cooling holes pump air through the engine while it is running. 2. Rear threaded mounting holes with 16mm and 19mm spacing adapt to a of applications. 3. Specially designed high temperature NdFeB magnets for -free operation. 4. The 140 C (356 F) high temperature cable is used to wind the motors to minimize the risk of burning the motor. 5. The high stator plates are coated with epoxy on the inner surface to prevent the shorts from bobbing. 0.20mm stator plate identifier used in this 5010 motor. High permanently shielded and lubricated are used to support the motor shaft in all engines. High temperature adhesives are used to the stator windings and prevent from moving and pinching or short-circuiting. Motor Size: 50 * 10mm Shaft Size: 4mm KV (rpm / v): 360kv Battery: 2-6 s -po ESC: 20-40A The work with 14-16 inch accessories Material:metal colour:Silver Package Contents: 1 * set Brushless Motor 5010 360kv Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.