Whether you're new to crafting or a pro, you'll appreciate this OLFA rotary mat. It not only protects your cutting surfaces, but it also protects the edges of rotary blades. The mat's grid lines are designed for easy measuring and accurate cutting of straight lines and precise angles. Good For: protecting cutting surfaces and extending the life of your rotary blades. 1.5mm thick. The double-sided mat is solid on one side for general crafting and has gridlines on the 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 the mat.