This is a four mecanum wheel drive mobile arduino robot kit, It includes 60mm aluminium mecanum wheels, four coreless 12V DC moter with encoders, Arduino 328 microcontroller board (It contains everything needed to support the microcontroller) and Arduino IO Expansion board (This sensor expansion board is able to easily connect a number of commonly used sensors)   

4WD 60mm Mecanum wheel arduino robot kit is stable, its chassis is made of aluminum-alloy body, and it can be made to move in any direction and turn by varying the direction and speed of each wheel.