17013 Columbia Flagstone (1/2" - 3/4" Deep) - Large, Irregular Cut Rock GrayLastic™Elastomeric Urethane - Up to 100 uses.Mold-bonded to 0.75" plywood. Add 1.125" to liner thickness. Max Depth: 0.50" - 0.75"Stone Size: 11" - 24" W x 8" - 12" HGrout Width: 0.75" Part Size:120" W x 48" H Click here for cut-sheet