This is an aluminum low CG battery tray for the Traxxas TRX4. Shown is the tray installed on a TRX4 kit model. The weight of the tray is comparable to a popular 3D-printed tray, but is more durable due to being made from aluminum. The finish is flat black powder coat. In the attached images, a 2200mAh 3S pack is strapped in.
This tray can accommodate a battery that is 4.6" long and 1.7" wide or smaller.