Use this OLFA rotary mat for any small to medium-sized craft or quilting project. The side with white guidelines is designed for precision cutting, while the solid side is for general cutting. The mat makes a great gift for anyone who enjoys crafting or quilting. 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: 18 1/2″ x 25″ (47 x 64 cm). Grid: 18″ x 24″ (46 x 61 cm)