. Made of high quality material. Easy to install and durable. Smooth and excellentrunning. 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. Learn More: Many vehicles are equppied with only common gearboxes with 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 an obvious counter action on the gear box as part of the vehicle body; therefore, the vehicle can incline toward one side under counter action while moving forward or climbing, and the larger the output torque of the shaft, the larger the counter action, the more the vehicle body inclines to one side. The vehicle can incline toward another side when it moves backward. Counter-transmission aims to eliminate the "shaft-induced effect" by adding another transmission gear set on the gear box at the same transmission ratio that allow one shaft rotates in the oppisite direction, thus counter actions exerted by front and rear output shafts being counteracted mutually. 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 Attributes:Assemblage Wheelbase:Screws color:Red / Yellow / Silver / Titanium / Black Material:Metal Package Contents: 1 x Gearbox 1 x Mounting Accessories Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.