Amtico Slate 18 x 18 Welsh Slate: 5.81 S/FT, covers 45.000 per S/FT, contains 20.000 per Box, measures 18.000 Inch long, 18.000 wide, weighs 30.000 lbs, in the Gray color family, composed of Vinyl, has a Squares design, Smooth surface type, Beveled...