The (1.5 inch) 38mm Plastic omni wheel is the smallest omni-directional wheel in all of Nexus omni wheels. It is unique as they are able to roll freely in two directions. And this 38mm omni wheel has 8 PU rollers. Its rollers are more durable, robust and flexible to provide the wheel 360 degree movement easily. This 38mm omni wheel apply to the small robot cars , robot platforms, small toys and so on.