OLFA 9832 Ncm-L 24" x 36" Self-healing Cutting Mat, Green 1.5mm thick Double-sided mat is solid Green on one side for general crafting and has yellow grid lines on other side for detailed cutting Self-healing finish reseals surface cuts, providing a continually smooth surface for all cutting projects Store flat and out of direct sunlight For use only with rotary blades and blades; fixed-blade knives blade may damage mat The self-healing mat has a long life, and extends the life of your rotary blades at the same time Use one side of the mat for precision cutting, the other for general cutting