Using these Cosmis XT - 206R wheels is straightforward. First, make sure they're compatible with your car as mentioned in the product description. Check the bolt pattern, offset, and hub bore size to ensure a proper fit. When installing, use the right tools and follow your car's manual. For maintenance, clean the wheels regularly with a mild soap and water solution. Avoid using abrasive cleaners that could damage the powder - coated clear coat. If you notice any scratches or chips, it's best to get them fixed as soon as possible to prevent rust. Also, be careful when driving over potholes or rough roads to avoid any potential damage to the wheels. And always remember, these wheels are sold individually, so buy the right quantity for your vehicle.