OLFA 24" x 36" Double-Sided, Self-Healing Rotary Mat 1.5mm thick Double-sided mat is solid green on one side for general crafting and has grid lines marking inches on other side for detailed cutting Self-healing finish reseals surface cuts, providing a continually smooth surface for all cutting projects Do not iron on mat, store flat and out of direct sunlight, avoid extreme hot or cold to prevent warping For use only with rotary blades and blades; fixed-blade knives blade may damage mat