In 90X90 slabs, the Mattone di Siena Series porcelain tiles feature a mosaic that mixes different textures and tones of the sandstone stone, characteristic of the Siena region in Italy. The marks of time and the natural wear and tear of the stones are faithfully reproduced thanks to HD technology, which allows the porcelain to be imprinted with unique characteristics that are full of meaning. They are ideal for swimming pool edges, balconies and sidewalks as they are 30% more adherent than conventional non-slip products. The ground edges allow forminimum1mm joints, even in outdoor areas. The color of the grout must follow the color of the internal joints of the piece so that, after laying and grouting, the mosaic effect is enhanced.