Total of 9 different robot chassis to choose from. They are made of green aluminum alloy, beautiful and durable. Equipped with a 520 motor with an encoder, it provides powerful power for your vehicle. Each aluminum alloy fittings are designed with copper post holes for screws at proper intervals. Users can install main control boards, riders, cameras, displays, and other equipment by themselves. We provide a free 3D model file for each chassis that the user can use for their own projects.