The Creative Grids® Self Healing Rotary Cutting Mat is double-sided. One side features one-inch grids with eighth-inch markings over the entire surface. All numbers are printed outside of the grid area so they are always visible. Popular 1-1/2 inch cuts are highlighted with white stars; 2-1/2 inch cuts with white squares. The other side is blank - perfect for trimming blocks and paper-piecing.