Polycarbonate Hub Centric Rings: These hub centric rings are designed to center the wheel on the vehicle's hub, therefore eliminating any vibration. They are manufactured from poly-carbonate plastic to the highest standards. The hub centric rings also help to prevent any damage to the vehicle's wheel and hub. They feature unique clips molded in for a solid, secure installation. Perfect for installing your set of Option Lab wheels on your vehicle. All of the Hub rings features a 73.1mm Outer Diameter, and please choose the right Inner Diameter for your vehicle. Ford Focus - 63.36 mm Inner DiameterHonda - 64.15 mm Inner DiameterNissan - 66.06 mm Inner DiameterMitsubishi EVO - 67.06 mm Inner DiameterSubaru - 56.15 mm Inner Diameter Please specify the exact year make and model of your car when purchasing a set of Option Lab wheels. All Hub Rings are sold as a set of four*Pictures used for marketing purposes only, actual product may vary