SOFT BLACK, 1 SQUARE METER (M2) OF 15x15 CM. PLAIN TILES About plain tiles A quality tile of black italien porcelain is used for all hand-printed ARTTILES. The italien tiles are dry pressed and pre-fired, in an black shade. This basis tile is chosen because of its superior durability; being 8mm thick, the utility of this tile is almost endless. Use it in kitchens and bathrooms as well as in floors.