4 Pieces - Hub Centric Rings - 74.1mm OD to 66.1mm ID - Dark Blue Poly Carbon Hub Rings Pls MEASURE your Vehicle Hub AND Wheel Center bore BEFORE BUYING Hub Ring Inner Diameter (Vehicle Hub Size): 66.1mm Hub Ring Outer Diameter (Wheel Bore Size): 74.1mm 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