DRITZ-Omnigrid Double-Sided Mat. This self-healing cutting mat features grids and markings in both inches and centimeters-- one on each side. The inch side has a 12x18 inch grid spaced every 1 inch with 1/8 inch increments on the edge rulers. The centimeter side has a 30x45cm grid spaced every 1cm with 1/2cm increments on the edge rulers. Both sides also have 45-degree angles lines included. Overall dimensions of the mat are 12-3/4x18-3/4 inches. Each package contains one mat. Imported.