Omnigrid-Gridded Cutting Mat. Has a self-healing 1.5mm thick base, 1/4 inch hash marks on all four sides, 1 inch grid marks on all four sides and two bias diagonals, markings are in yellow. There is a cutting surface on both sides, and grids on one side. This package contains one 24×18 inch mat with a 1/2 inch salvage all around. Color: Royal Blue. WARNING: Contains Phthalates: known to the State of California to cause birth defects and other reproductive harm. Imported.