From the manufacturer:
This mat has a tacky adhesive to secure the material for cutting. It is specifically designed to be used numerous times with a wide range of materials from fabrics to handmade papers. The ideal for thickness of materials to be cut can range from 0.2 mm-1.5 mm. Always test material on mat before beginning project to make sure this is the proper mat to be used. For use with Brother cutting machines. This package contains one 12x12 inch standard mat. Imported.