Halley Silver is a 24" x 24" porcelain tile with rectified edges, which allows a tighter grout joint. The face carries the even, slightly clouded tone of poured concrete. A lappato surface is part polished and part matte, so it lifts light without the full shine of a polish. A PEI 4 rating suits heavy residential and light commercial floors. It is frost resistant, so it can run from an interior floor onto a covered porch or patio. A box holds 4 pieces and covers 15.5 square feet. Made in Spain.