Plastic hub ring is cheaper than aluminum hub ring,it is installed between the vehicle's hub and the wheel center bore. The hub ring fills in the gap between the vehicle hub and the center bore of the wheel. This is assuming that your wheel's center bore is not already perfectly centered on your vehicle's hub lip.
Specification:
Part Number: HR-02
Color:black,silver,red,orange,green,blue...
Material: Poly Carbon Plastic