Using these Cosmis Racing wheels is straightforward. First, make sure your vehicle is on a flat and stable surface. Check that the wheels are the correct size and fit for your car before installation. You don't need spacers if you have a Ford Focus ST or RS, but always double - check the bolt pattern and offset. When installing, tighten the bolts evenly to avoid any issues. As for maintenance, regularly clean the wheels with a mild soap and water solution. Avoid using harsh chemicals as they can damage the white finish. After cleaning, dry the wheels thoroughly to prevent rust. Also, check the wheel bolts periodically to ensure they remain tight. And remember, since this part isn't application - specific, it's important to verify compatibility before you buy to save time and money.