4 pieces - Hubcentric Rings - 73.1mm OD to 56.1mm ID - Black Poly Carbon Hubrings Hub Ring Inner Diameter (Vehicle Hub Size): 56.10mm Hub Ring Outer Diameter (Wheel Bore Size): 73.10mm 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 Please see Product Description section below for more Vehicle Compatibility