Description Each 6x24 panel = 1 square foot. Each panel varies in color slightly. Panel is made of quartzite. Available in straight. Perfect for outside and inside application.All Natural Stone products such as granite, marble, etc. are a product of nature and have color, shade, density, and veining variation. When installing, it is recommended to mix tiles from different boxes. All natural stone products should be sealed with a penetrating sealer and maintained with product appropriate cleaners.