Seneca Tiles. No it's not silk; rather, it's Klis--an Italian-made porcelain glazed ceramic product that mimics the fabric. The wall and floor tile measures 18 by 18 inches and comes with rectified edges like natural stone so pieces can butt together for a tight fit. It comes in eight colors and in mosaics or 18-inch pieces measuring 1, 2, 6, or 9 inches wide.