Made of high quality material. Easy to install and durable. Smooth and excellent running. This Gearbox does not change speed, only 1 Speed. This Gearbox only has a transmission function, it does not have a reverse transmission function. Suit for 1/10 RC Crawler Axial SCX10 AX10 Wraith. Many vehicles are equipped with common gearboxes that have only one output shaft shared by front and rear axles. In this case, the shafts of front and rear axles rotate in the same direction and exert a counter force on the vehicle body. As a result, the vehicle may lean to one side when moving forward or climbing, especially under high torque. The greater the output torque, the more noticeable the body lean. When moving in reverse, the vehicle may lean to the opposite side. Counter-transmission helps reduce the "shaft-induced effect" by adding an additional gear set at the same transmission ratio, allowing one shaft to rotate in the opposite direction. This design enables the counter forces from the front and rear output shafts to cancel each other out, improving stability. Tool Supplies: Assembly Category RC Parts & Accs: Servo Accessories Use: Vehicles & Remote Control Toys Technical parameters: Value 2 Remote Control Peripherals/Devices: Receivers For Vehicle Type: Cars Four-wheel Drive: Assemblage Wheelbase: Screws Color: Titanium Material: Metal Package Contents: 1 x Gearbox 1 x Mounting Accessories Set Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement allowance is +/- 1-3 cm.