The 12 x 18" Omnigrid double-sided cutting mat is ideal for use in quilting for cutting fat quarters and smaller pieces of fabric. It features a 1" grid, and 1/8in edge markings and angle line markings on one side; the opposite side is metric, with a centimeter grid, millimeter edge markings and angle line markings - both sides of the mat are ideal for ruler/grid alignment and cutting. Couple your Omnigrid mat with an Omnigrid ruler for ultimate measuring and cutting accuracy.