This self-healing cutting mat features grids and markings in both inches and centimeters-- one on each side. It's the perfect tool for a variety of projects! Details:Green with gold markings12" x 18" (30cm x 45cm) grid size12.75" x 18.75" overall mat sizeDouble sided1" with 1/8" edge increments1 cm with 0.5 cm edge incrementsBoth sides include 45 degree angle linesFor use with Omnigrid ruler, rotary cutter, or straight edge blade (sold separately)