With its smooth, unglazed surface and its slight shade variation, the Jeffrey Court Rockwood Pencil 12 in. x 12 in. Glass and Stone Mosaic Wall Tile can be installed alongside stone or ceramic field tiles (sold separately) to create a coordinated look. Mesh-mounted Mosaics can be used as a whole sheet or cut to make affordable feature strips. Penetrating sealers recommended before grouting. Recommend white “polymer-modified” thin set and non-sanded grout for best installation results.