Polishing process/3rd step in wheel finishing process is done with porcelain balls, and use special brightening compound that in combination with porcelain balls bring the high gloss to the rim/wheel surface. This process last 2.5 to 3 hrs, depending of the wheel material quality and how they are made - such as casting, forging, machining etc....For more information on polishing media, compound and machine, please inquire trough info@massfin.ca