Cinca is a quality unglazed porcelain tile ideal for both interior and exterior wall and floor mosaic applications. The tiles are 2.3 cm square and 4 mm deep. These are mesh backed, which can be soaked off. Each sheet is 30cm square and holds 144 tiles. A quarter sheet holds 36 tiles and half sheet 72 tiles. Twelve sheets would be enough to cover a square metre, with some wastage. Please note: Cinca is very slightly porous, and if using outside should be sealed with a clear penetrating tile sealer. In addition, if you are going to grout with a very contrasting grout colour; eg; pale tile with dark grout, you may wish to seal the Cinca before grouting, as this will make it easier to clean and lessen the possibility of grout staining.