Item is manufactured using an automotive-grade ABS-plastic. These chrome moldingss are installed onto the top of your 300's existing roof moldings using industry-leading 3M adhesive technology. The pieces are removeable in the event you are leasing your car or just want to remove it at a later date. This item comes with a 5-YEAR WARRANTY that guarantees the item won't chip, crack, tarnish, peel, or fall off. If you have any problems with the item in the next 5 years, we will replace it free!