The 60mm Mecanum Wheel Set (1x Left, 1x Right) is the smallest size mecanum wheel in all of aluminum mecanum wheels. Each wheel is comprised of a series of rollers. Using rollers on 45° rotational axis parallel to the rotational axis of the wheel. The set of 60mm mecanum wheels include 1 left wheels and 1 right wheels. You can also use universal hubs to connect the wheels and motor.