Using these window sill covers is easy. First, gather all the items included in the 4 - piece kit. Make sure your car is clean before you start the mounting process. Follow the instructions carefully to ensure a proper fit. When it comes to maintenance, use a mild car cleaner to keep the carbon fiber looking its best. Avoid using harsh chemicals as they can damage the finish. And remember, because of the production process, if it ships from the factory, you'll have to wait 6 - 8 weeks for it to arrive.