Features: 1Steel Materials: RC car differential assembly is made of steel materials, durable, wear resistant, high strength and more refined appearance. 2Effectively Improve Performance: RC differential assembly can decelerate, increase the torque of the engine, and make the remote control car run smoothly. 3Efficient Deceleration Power: Designed for more efficient deceleration power, can be used to change speed for a smoother ride, lower revs and higher torque. 415T 17T 19T Motor Gear: Provide 3 kinds of pinion gears with different numbers of teeth, so that you have more choices in transmission ratio and make your RC car perform better. 5Precise Shape and Size: Manufactured to precise shape and size to provide a balanced ride that maximizes the RC car's deceleration performance. 6Easy to Install and Disassemble: The original plastic parts or damaged parts can be directly replaced to obtain higher strength. Suitable for Traxxas Slash 4x4, for E Revo, for T Maxx and other RC cars. Package included: 1 x Differential Assembly 3 x Gear 3 x Conversion Axis 3 x Machine Screw