Our signs are made of 14-gauge recycled steel. This is not the typical big company, big quantity product. We make them a step above in quality to ensure they will last. Raw steel is a highly recyclable material that gets used over and over again. Each raw piece comes to you dark gray to blue gray, depending on the heating process when the sheet of steel is created. If left untreated, raw steel will naturally rust with your environment, giving your product its own natural unique look. Steel wool will remove any rust that develops.