Inspired by the classic BBS wheels on racing Porsches that had a conical cover over the spokes.
This hubcap is made to go over a Lego 56x34mm Technic Racing Wheel Medium. It has a hole for a crossaxle in the center so if your model uses Technic axles through the center of the wheel you can still mount the hubcap. A half-bushing in the center is recommended for a good grip on the axle.