With its smooth, unglazed surface and its slight shade variation, the Jeffrey Court Icelandic Pencil, 10.5 in. x 11.875 in., Glass and Marble 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.