The 22-1/2" x 14-1/2" Nonstick Fiberglass Sheet (320412) from Matfer Bourgeat, Inc. is made with a thickness of 1/10 mm. This product is meant to protect black-steel baking sheets and provide a nonstick surface. You can cut this sheet to the desired size, but do not tear it. With proper care, you can use the sheet in excess of 1,000 times, depending on the use. This sheet is safe for use at temperatures ranging from minus 40 to 450 degrees Fahrenheit.