Dorado River Rock Mesh-Mounted Mosaic is a Natural Stone Marble. This tile has random pieces of flat tumbled rock, mounted on a 12 in. x 12 in. mesh sheet for ease of installation. A blend of elegant white color shades make it an attractive option to complement any install in a wide variety of design schemes, including kitchens and bathrooms. Note: Inspect all tiles before installation. Natural stone products inherently lack uniformity and are subject to variation in color, shade, finish, etc. It is recommended to blend tiles from different boxes when installing. Natural stones may be characterized by dry seams and pits that are often filled. The filling can work its way out and it may be necessary to refill these voids as part of a normal maintenance procedure. All natural stone products should be sealed with a penetrating sealer.