Whatever the size of your crafting project, this OLFA rotary mat will serve you well. 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. Good For: protecting cutting surfaces and extending the life of your rotary blades. 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. Mat: 24 1/2″ x 37″ (62 x 94 cm). Grid: 24″ x 36″ (61 x 91 cm)