WUZHOU High strength material --- Made of high quality metal, features high strength and durability, not easy to damage and can be used for a long time. Excellent workmanship --- Professional manufacturing for high accuracy, perfectly matched model can replace the original parts. Function --- Differential can make the left and right RC wheels realize the mechanism that rotates at different speeds. High performance --- Can improve the performance of the RC car and add more fun to your remote control. Delivery Quantity: 1 Piece Package Contents: Only the above package contents, excluding other products. Size: 4.2*2.8 (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: Black (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)