4 Pieces - Hub Centric Rings - 72.6mm OD to 63.4mm ID - Yellow Poly Carbon Hub Rings Pls MEASURE your Vehicle Hub AND Wheel Center bore BEFORE BUYING Hub Ring Inner Diameter (Vehicle Hub Size): 63.4mm Hub Ring Outer Diameter (Wheel Bore Size): 72.6mm Made out of High Quality Poly Carbon Plastic. They will not corrode or melt in a regular condition Designed to Eliminate Vibrations caused by Custom Wheels not centering correctly onto vehicle's hub