By bouncing incoming light around a room, our Luster 4 in.x12 in. Glass Field Tile helps create a larger looking space in your home. With its smooth glossy surface and uniform shade variation, the Jeffrey Court Luster 4 in. x 12 in. x 8mm Glass Wall Tile can be installed alongside mosaics (sold separately) to create a coordinated look. Penetrating sealers recommended before grouting. Recommended for kitchen backsplashes, showers, accent walls, tub surrounds, and vanities. Recommend white polymer-modified thin set and either sanded or non-sanded grout for best installation results.