Amtico Linear 18 x 18 Linear Chalk: 5.81 S/FT, covers 45.000 per S/FT, contains 20.000 per Box, measures 18.000 Inch long, 18.000 MM wide, 2.500 Inch thick, weighs 30.000 lbs, in the Off White color family, composed of Vinyl, has a Squares design, Smooth surface type, Beveled edge type, Square end type, has a 15 year warranty