The Multi-Chassis 4WD Robot Kit (Basic) is an easy to assemble and use robot chassis platform. The Multi-Chassis kit provides everything you need to give your robot a fast four wheel drive platform with plenty of room for expansion to add various sensors and controllers. This Multi-Chassis Basic 4WD Kit includes four 48:1 DC gearboxes that independently drive each of the 65mm low-profile wheels. Each side of the 2.5mm thick aluminum frame comes cut with plenty of attachment points to add a multitude of different robot controllers, drivers and sensors.