Features: brand new and high quality Made of quality light weight high tensile strength aluminum alloy for good for protection and heat cooling. Better thermal conductivity, good for heat dissipation. Accurate bearing position ensures the differential gears are running steadily and smoothly. Oil filling hole type gear box cover is more convenient, only need to open the screw in the hole, no need to remove the entire outer cover. The position of the upper A-frame and the lower keel can be adjusted with multiple holes. Specifications: Material:Aluminum Alloy Color:Black/Red/Silver Suitable: for Axial JR AX90052 AX90069 Size: Approx.13.6x3.48 for cm/5.35x1.37 inches Package Includes: 1x Rear Gear Box note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.