Packing list: The package contains 2 left wheels and 2 right wheels (you need to choose the size of the omnidirectional wheels), 4 metal hexagonal couplings | The Mecanum wheel has a compact design, and the roller is made of high-strength polyurethane, which has a strong load capacity, no degumming, quiet and wear-resistant, and reduces ground damage | Omni-directional mobile automatic guided vehicle was born. As the key component of omni-directional movement, omni-directional wheels can easily change direction and move widely. In order to adapt to the narrow space and improve the flexibility and stability of movement | The mecanum wheel has become the first choice for DIY Smart Robot Car Chassis, providing more direction choices for raspberry pi arduino jetson programming electronic competition projects | Yahboom provide some tutorials as a reference, which contains a variety of mobile control methods such as, left and right translation, large-angle drift, oblique 45° direction movement, square track movement, etc.