Self-healing professional quality cutting mat especially designed for use with OLFA standard-duty cutters, heavy-duty cutters, extra heavy-duty cutters, art knives, rotary cutters and specialty cutters. Double-sided with green base color and gray guidelines on one side for precision cutting, solid green on opposite for general cutting. Helps protect cutting surfaces and extend the blade life. 3-layer engineering helps extend mat life. 3.0mm thick for a variety of applications. Store flat and out of direct sunlight.