· Rock & Rock Shellstone 21 x 21 Gris offered at $6.52 S / FT · covers 12.510 per S / FT · contains 4.000 per Box · measures 21.250 Inch in length · measures 21.250 Inch in width thick · weighs 60.600 lbs · in the Gray color family · composed of Porcelain · has a Tile