The 100mm Slim Mecanum Wheel Set comes with 2 left and 2 right, and steel ball bearings. With blue steel frame and black rollers. The wheel is comprised of 12 black rollers and is able to move in any direction. Rollers are set at 45° to the axis of rotation of the wheel.
Rollers are mounted with steel ball bearings, making the roll more fluent.
The following hubs (purchased seperately) will work with these wheels