Air-filled 8x2 i.e. 8 inch wheel with SKF bearings. A tire without inner rubber that makes it really durable and long-lasting. The package includes the tire itself, aluminum rim and bearings. Just remove the previous one and replace it with a new one. Otherwise largely maintenance-free, but common sense can be used with the air pressure - maintain the appropriate pressure.
Meeko City drives this on the front wheel.