Creative Grids Double Sided Self Healing Rotary Cutting Mat 18" x 24"The Creative Grids rotary cutting mats are self healing and double sided. Our 5 layer cutting mat gives you two cutting surfaces and two separate layers of self healing material. One side features 1in grid with 1 8in markings. All numbers are printed outside of the grid area, so they are always visible as you work. Popular 1 1 2in cuts are highlighted with white stars, 2 1 2in cuts with white squares, for both horizontal and vertical cutting. 1 8, 1